Dear Colleagues,

Coffee, tea & biscuits will be available = in the School of=C2=A0Mathematics=C2=A0&= ; Statistics common room, ground floor,=C2=A0UCD=C2=A0O'Brien Centre for Science (North)<= font size=3D"-1">=C2=A0beforehand.

=

All are welcome. =
Details of the=C2=A0seminar=C2=A0follow.=

=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D

UCD=C2=A0Applied=C2=A0&=C2=A0Computational=C2=A0Mathematics=C2=A0Semin=
ar=C2=A0=C2=A0=C2=A0=C2=A0

=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D

**=
Speaker:=C2=A0**Peter Lynch (University College Dublin)

**Time:**=
=C2=A0Monday, 9th September 2019 at 1pm

**Location: **1.25 SCN,=C2=A0=
UCD=C2=A0O'Brien Centre for Science (No=
rth)

**Title:**=C2=A0Integrable elliptic billiards and ballyards

<= /font>

**Abstract:<=
/b>****The billiard problem concerns a point particle moving =
freely in a region of the horizontal plane bounded by a closed curve $\Gamm=
a$, and reflected at each impact with $\Gamma$. The region is called a `bil=
liard', and the reflections are specular: the angle of reflection equal=
s the angle of incidence. We review the dynamics in the case of an elliptic=
al billiard. In addition to conservation of energy, the quantity $L_1 L_2$ =
is an integral of the motion, where $L_1$ and $L_2$ are the angular momenta=
about the two foci.**

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D **=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D**

Best wishe= s,

Barry Wardell

t= itle::=C2=A0UCD=C2=A0ACM=C2=A0Seminar

date-time:: Monday 9th September 2019 at 1:= 00pm

location:: 1.25 SCN,=C2=A0UCD=C2=A0= O'Brien Centre for Science (North)

content::=C2=A0Peter Lynch (University College= Dublin)=C2=A0= will speak on

::=C2=A0Integrable elliptic billi= ards and ballyards

=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D

UCD=C2=A0Applied=C2=A0&=C2=A0Computational=C2=A0Mathematics=C2=A0

=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D

<= /font>

We can regularize the billiard prob=
lem by approximating the flat-bedded, hard-edged surface by a smooth functi=
on. We then obtain solutions that are everywhere continuous and differentia=
ble. We call such a regularized potential a `ballyard'. A class of ball=
yard potentials will be defined that yield systems that are completely inte=
grable. We find a new integral of the motion that corresponds, in the billi=
ards limit $N\to\infty$, to $L_1 L_2$.

Just as for=
the billiard problem, there is a separation of the orbits into boxes and l=
oops. The discriminant that determines the character of the solution is the=
sign of $L_1 L_2$ on the major axis.

Best wishe= s,

Barry Wardell

t= itle::=C2=A0UCD=C2=A0ACM=C2=A0Seminar

date-time:: Monday 9th September 2019 at 1:= 00pm

location:: 1.25 SCN,=C2=A0UCD=C2=A0= O'Brien Centre for Science (North)

content::=C2=A0Peter Lynch (University College= Dublin)=C2=A0= will speak on

::=C2=A0Integrable elliptic billi= ards and ballyards

The Atlas of Irish Maths: Carlow

<=
br>

New blog: http://www.mathsireland.ie/blog/2019_08_cm=C2=A0<=
/div>

Includes Michael O'Riordan from late 1700/earl=
y 1800s (can you solve his triangle problem from 1784?), John Tyndall the f=
irst Irishman to get maths doctorate (1850) and Sam Haughton.=C2=A0 In the =
past few days 8 new photos of people from long ago have been acquired and a=
dded.

RTC/IT Carlow staff cov=
erage is a lot sketchier than we'd like. There are many people who work=
ed there in decades past for whom we have little more than names.

Coming in late October blog: over 50 maths p=
eople associated with county Down!

See=C2=A0http://www=
.mathsireland.ie/blog/upcoming for a list of the known Down people pre =
1900.

Colm Mulcahy, Professor of Math= ematics, Spelman College, Atlanta, GA 30314, USA,=C2=A0Annals of Irish Maths=C2=A0=C2= =A0

Dear All,<= /p>

We will have a seminar Thursday (Sept 12= ) at 4pm in ADB1020.

Cof= fee/tea/cakes/biscuits will be served in ADB-G022 from 3:30.

=C2=A0

= will speak on

=E2=80=9CMatroids, delt= a-matroids, maps, and rigidity matroids"

~~Abstract:=C2=A0We will introduce delta-matroids through matroi=
ds and their applications=C2=A0~~

=C2=A0

Contact: James Cruickshank

=C2=A0

Hoping t= o see you all there,

=C2=A0

Haixuan and Michael

=C2=A0

Fu= ture seminars are listed at=C2=A0http://www.nuigalway.ie/scien= ce/school-of-maths/seminars/

Dublin=C2=A0Theoretical=C2=A0=
Physics=C2=A0Colloquium

Time: Wed= nesday, 11th of September at 16:00 p.m.

Location:=C2=A0Syng= e=C2=A0Theatre, Hamilton Building, TCD

Time: Wed= nesday, 11th of September at 16:00 p.m.

Location:=C2=A0Syng= e=C2=A0Theatre, Hamilton Building, TCD

Speaker: Pre=
m Kumar (Swansea University)

Title: &q=
uot;Higher spin holography and the chaos bound in 2d CFT<=
/span>"

Abstract:=C2=A0

I will describe the th= ermodynamics and real time correlators in holographic CFTs with extended W-= symmetries, dual to AdS_3 gravity with a finite number of higher spin field= s.=C2=A0 I will outline some universal results on entanglement entropy for = such CFTs held at finite chemical potential for higher spin charge dual to = higher spin black hole in AdS_3. Building on these, we calculate OTO corre= lators following local quenches by CFT operators carrying higher spin charg= es, and point out potential violations of the Maldcena-Shenker-Stanford cha= os bound. In the special case of holographic CFTs with "non-principal= =E2=80=9D W-symmetries we point out the appearance of a nontrivial ground s= tate with negative conformal dimension leading to a violation of the chaos = bound as expected for non unitary CFTs. The mechanism for this follows from= a more generic phenomenon=C2=A0 where insertions of large dimension primar= y operators results in the emergence of a new rescaled effective temperatur= e controlling the correlation functions of light operators.

All are welcome!

title::=C2=A0Dublin=C2=A0Theoretical=C2= =A0Physics=C2=A0Colloquium=

content::=C2=A0Prem Kumar (Swansea University)=C2=A0w= ill speak on

::=C2=A0Higher spin holography and t=
he chaos bound in 2d CFT

date-time::=C2=A0 Wednesday the 11th of = September at 16:00pm

location::=C2=A0Synge=C2=A0Theatre, Hamilton Building, Trinity College=C2=A0Dublin

endevent::

date-time::=C2=A0 Wednesday the 11th of = September at 16:00pm

location::=C2=A0Synge=C2=A0Theatre, Hamilton Building, Trinity College=C2=A0Dublin

endevent::

Thanks to=C2=A0Brendan Murphy, James Wa= rd, Colm O Dunlaing and especially=C2=A0David Spearman, we have filled in some of th= e gaps, as now reflected at Wikipedia here h= ttps://en.wikipedia.org/wiki/Donegall_Lecturership_at_Trinity_College_Dubli= n

The WP for mathematician=
James Wilson just went live:=C2=A0https://en.wikipedia.org/wiki/James_Wilson_(=
mathematician)

Not to be confus=
ed with bishop of the same name/period:

*He* contri=
buted=C2=A0maths problems/solutions to the Educational Times.=C2=A0 And was=
a pal of George Boole.

are linked to personal Wikipe= dia pages, the other people don't have WPs yet.=C2=A0 Would anyone like= to assist in creating such WPs?=C2=A0 They can be brief/skeletal, or more = detailed.=C2=A0 I favour having at least something on Wikipedia for most of= these people, but don't have the time to research/write such WPs.

<= /div>

c

Colm Mulcahy, Professor o= f Mathematics, Spelman College, Atlanta, GA 30314, USA,=C2=A0Annals of Irish Maths

=***SPEAKER CANCELLED HIS VISIT BUT WILL GIVE A= N ONLINE SEMINAR INSTEAD**

**VENUE IS CHANGED TO NEW SEM=
INAR ROOM**

<=
/div>

--000000000000a6af520592419db5--
From owner-mathdep LISTSERV.HEANET.IE Wed Sep 11 09:58:18 2019
Return-Path: Dublin=C2=A0Theoretical=C2=
=A0Physics=C2=A0Colloqui=
um

Time: Wednesday, 11th of September at 16:00 p.m.

Lo= cation: New Seminar Room, Hamilt= on Building, TCD

<=
div dir=3D"ltr">Speaker: Prem Kumar (Swansea University) =C2=A0**** ONLINE =
SEMINAR***Time: Wednesday, 11th of September at 16:00 p.m.

Lo= cation: New Seminar Room, Hamilt= on Building, TCD

Title: "Hi=
gher spin holography and the chaos bound in 2d CFT"

=

All are welcome!

Abstract:=C2=A0

I will describe the thermodynamics a= nd real time correlators in holographic CFTs with extended W-symmetries, du= al to AdS_3 gravity with a finite number of higher spin fields.=C2=A0 I wil= l outline some universal results on entanglement entropy for such CFTs held= at finite chemical potential for higher spin charge dual to higher spin b= lack hole in AdS_3. Building on these, we calculate OTO correlators followi= ng local quenches by CFT operators carrying higher spin charges, and point = out potential violations of the Maldcena-Shenker-Stanford chaos bound. In t= he special case of holographic CFTs with "non-principal=E2=80=9D W-sym= metries we point out the appearance of a nontrivial ground state with negat= ive conformal dimension leading to a violation of the chaos bound as expect= ed for non unitary CFTs. The mechanism for this follows from a more generic= phenomenon=C2=A0 where insertions of large dimension primary operators res= ults in the emergence of a new rescaled effective temperature controlling = the correlation functions of light operators.

=

All are welcome!

Dear Colleagues,

Coffee, tea & biscuits = will be available in the School of=C2=A0Mathematics=C2=A0& Statistics common room, grou= nd floor,=C2=A0UCD=C2=A0O'Brien Centre for Science (North)

All are welcome. De=
tails of the=C2=A0seminar=C2=A0follow.

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

UCD=C2=A0Applied =C2=A0=
&=C2=A0Compu=
tational=C2=A0Mathematics=C2=A0Seminar=C2=A0=C2=A0=C2=A0=C2=A0

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D

**Speaker:=C2=A0**Jonathan Thompson=C2=A0(Cardiff Univ=
ersity)

**Time:**=C2=A0Monday, 16th September 2019 at 1pm

**Locat=
ion:=C2=A0**1.25 SCN,=C2=A0UCD=C2=A0O'Brien Centre for Science (North)

**Title:=C2=A0Self-force Regularization in Regge-Wheeler-type Gauges**

**Abstract:**

=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=

Best= wishes,

Barry Wardell

title::=C2=A0UCD=C2=A0ACM=C2=A0Sem= inar

date-time:: Monday 16th September 2019 at 1:00pm

location= :: 1.25 SCN,=C2=A0UCD=C2=A0O'Brien Centre for Science (North)

content::=C2=A0= Jonathan Thompson=C2= =A0(Cardiff University)=C2=A0will speak on

::=C2=A0Self-force= Regularization in Regge-Wheeler-type Gauges

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

UCD=C2=A0

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D

Knowledge of the gravitational self-force felt by a compa=
ct object inspiraling into a supermassive black hole will be vital for the =
construction of phase-accurate gravitational waveforms used for LISA. Calcu=
lating the self-force over the thousands of orbits necessary during the ins=
piral is an expensive hurdle quickly approaching the costs of numerical rel=
ativity simulations. One avenue toward increasing computational efficiency =
may be to work in gauges better suited to fast numerical computation of the=
metric perturbation produced by the compact object, from which the self-fo=
rce is calculated. We investigate the steps required to regularize the self=
-force in gauges where the metric perturbation arises from the integration =
of a single one-dimensional wave equation; the most common of these gauges =
is the Regge-Wheeler gauge.

=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Best= wishes,

Barry Wardell

title::=C2=A0UCD=C2=A0ACM=C2=A0Sem= inar

date-time:: Monday 16th September 2019 at 1:00pm

location= :: 1.25 SCN,=C2=A0UCD=C2=A0O'Brien Centre for Science (North)

content::=C2=A0= Jonathan Thompson=C2= =A0(Cardiff University)=C2=A0will speak on

::=C2=A0Self-force= Regularization in Regge-Wheeler-type Gauges

I would like to bring to the attention of colleagues the following vacancy =
in TU Dublin.

The School of Mathematical Sciences, Technological University Dublin =
(TU Dublin) is currently advertising for a Pro-Rata Part-Time Assistant Lec=
turer in Statistics (Fixed term, Specified Purpose up to 3 Years) (9 Hours)=
(Reference: A/130/19).

The closing date for applications is 5pm,=
2 October 2019.

Details, including the candidate brief, can be found at: http://www.dit.ie/vacancie=
s

This email originated from TU Dublin. If you received this email in error, =
please delete it from your system. Please note that if you are not the name=
d addressee, disclosing, copying, distributing or taking any action based o=
n the contents of this email or
attachments is prohibited.

Is =F3 OT Baile =C1tha Cliath a th=E1inig an r=EDomhphost seo. M=E1 fuair t=
=FA an r=EDomhphost seo tr=ED earr=E1id, scrios de do ch=F3ras =E9 le do th=
oil. Tabhair ar aird, mura t=FA an seola=ED ainmnithe, go bhfuil dianchosc =
ar aon nochtadh, aon ch=F3ipe=E1il, aon d=E1ileadh n=F3 ar aon ghn=EDomh
a dh=E9anfar bunaithe ar an =E1bhar at=E1 sa r=EDomhphost n=F3 sna hiat=E1=
in seo.

title:: UCD Algebra and N=
umber Theory Seminar

content::=C2=A0Sergey Mozvogoy (TCD)=C2=A0will spea= k on

::=C2=A0Commuting matrices and Higman's conjecture

date-time= :: Thursday,=C2=A0September 19, 2019 at 2:00pm

content::=C2=A0Sergey Mozvogoy (TCD)=C2=A0will spea= k on

::=C2=A0Commuting matrices and Higman's conjecture

date-time= :: Thursday,=C2=A0September 19, 2019 at 2:00pm

location::=C2=A0~~Room 1.25, O=E2=
=80=99Brien Centre for Science (North)~~

endevent::

endevent::

Time: Wednesday, 18th of September at =
16:00

Location: =
Synge Theatre, Hamilton Building, TCD

Speaker: Meng-Chwan Tan (Singapore =
National University)

Title: "Boundary N=3D2 Theory, Floer Homologies, Affine Algebras, and =
the Verlinde Formula"

Abstract:

I will explain how topologically-twisted N=3D2 =
gauge theory on a four-manifold with boundary, will allow us to furnish =
purely physical proofs of (i) the Atiyah-Floer conjecture, (ii) Munoz's =
theorem relating quantum and instanton Floer cohomology, (iii) their =
monopole counterparts, and (iv) their higher rank generalizations. In =
the case where the boundary is a Seifert manifold, one can also relate =
its instanton Floer homology to modules of an affine algebra via a 2d =
A-model with target the based loop group. As an offshoot, we will be =
able to demonstrate an action of the affine algebra on the quantum cohomology of the moduli =
space of flat connections on a Riemann surface, as well as derive the =
Verlinde formula.

All =
are welcome!

=
--Apple-Mail=_51CDFA10-37A5-48AB-A62C-8DC15B084139--
From owner-mathdep LISTSERV.HEANET.IE Mon Sep 16 11:23:59 2019
Return-Path: Dear All,<= /p>

We will have a seminar Thursday (Sept 19= ) at 4pm in ADB-1020.

Coffee/=
tea/cakes/biscuits will be served in ADB-G022 from 3:30.

=C2=A0

Niall Madden from NUI Galway=C2=A0will speak on

"Balanced norms for boundary =
layer problems: if you can't see it, you can't compute it."

Abstract:=C2=A0<= /p>

Many phys= ical phenomena have layer features: regions where=C2=A0they change very rapidly. Models for these phenomena are often

described in the language of differential equations,=
and much of the efforts of modern numerical analysis are devoted to develo=
ping algorithms to compute approximations to them. But an approximation is =
worth nothing unless accompanied by a reliable estimate for how accurate it=
is.

The most popular family of algorithms for computing numerical solutions =
to differential equations are Finite Element Methods. They are so ubiquitou=
s in the field that it comes as something of a shock to learn that, for bou=
ndary layer problems, the standard accuracy estimates are essentially usele=
ss.=C2=A0 The problem is that the norms they use -- ways of summarising the=
global error as a single real number -- can't detect the presence of l=
ayers.

In this talk, I'll give a brief introduction to differential e=
quations, and singularly perturbed ones in particular. This will be followe=
d by a crash-course in Finite Element Methods. Next, I'll explain why t=
he usual norms are inadequate. To finish, I'll present a new method tha=
t, we claim, resolves this problem.

<= /div>

This talk is based on very recent work wi=
th James Adler (Tufts) and Scott MacLachlan (Memorial).

=C2=A0

Hoping to se= e you all there,

=C2=A0

Haixuan and Michael

Plans are underway for the=C2=A0Irish Mathematics Calendar=
2020.

--000000000000fa0ca70592b55cef--
From owner-mathdep LISTSERV.HEANET.IE Tue Sep 17 11:09:05 2019
Return-Path: Please send details of events to consider includi=
ng: conferences, annual lectures, etc

Four earlier=
=C2=A0calendars (including this year's) are downloadable here:=C2=A0http://www.mathsireland.ie/annals-of-irish-mathema=
tics-mathematicians/irish-maths-calendar

Thank=
you

c

Colm Mulcahy, Professor of Mathematics, Spelman College, Atlanta,=
GA 30314, USA, Annals of Irish M=
aths=C2=A0=C2=A0

UCD School of Mathematical Sciences - Seminar Notice

Speaker: ** Oleg Zaboronski (Warwick)**

Title: **Dimensional reduction for elliptic SPDE's: integrable structures and large deviations**

Date: Wed 25th September 2019

Time: 2:00PM

Location: Seminar Room SCN 1.25

Abstract: I will review the phenomenon of dimensional reduction for elliptic stochastic PDE's in two and three dimensions due to hidden supersymmetry discovered by Parisi and Sourlas. I will use dimensional reduction to establish a link between matrix-valued elliptic SPDE's and determinantal point processes. I will show that the large deviations principle can be proved for a class of equations without any reference to supersymmetry. The talk is based on joint work with Roger Tribe and David Elworthy.

Further Information

-------------------------------------------------------------

For other seminars in the Probability series, click http://mathsci.ucd.ie/seminarseries/probability

-------------------------------------------------------------

The following formats the above notice so as to be included in the mathdep google calendar

title:: Dimensional reduction for elliptic SPDE's: integrable structures and large deviations

content:: Oleg Zaboronski (Warwick)

:: UCD Probability seminar (http://mathsci.ucd.ie/seminarseries/probability)

location:: Seminar Room SCN 1.25

date-time:: Wed 25th September 2019 at 2:00PM

UCD School of Mathematical Sciences - Seminar Notice

Speaker: ** Elia Bisi (UCD)**

Title: **Transition between characters of classical groups, decomposition of Gelfand-Tsetlin patterns & last passage percolation**

Date: Wed 2nd October 2019

Time: 2:00PM

Location: Seminar Room SCN 1.25

Abstract: We produce a family of symmetric polynomials that interpolate between irreducible characters of symplectic and orthogonal groups, perturbing their expressions as generating functions of Gelfand-Tsetlin patterns. Such a family can be viewed as a one-parameter specialization of Koornwinder polynomials, for which we thus provide a novel combinatorial structure. We next develop a method of Gelfand-Tsetlin pattern decomposition to establish identities between all characters of classical groups, as well as the aforementioned interpolating polynomials. From the probabilistic viewpoint, these identities are all linked to last passage percolation models with various symmetries. Taking the scaling limit, we provide an explanation of why the Tracy-Widom GOE and GSE distributions from random matrix theory admit formulations in terms of both Fredholm determinants and Fredholm Pfaffians. Based on joint work with Nikos Zygouras.

Further Information

-------------------------------------------------------------

For other seminars in the Probability series, click http://mathsci.ucd.ie/seminarseries/probability

-------------------------------------------------------------

The following formats the above notice so as to be included in the mathdep google calendar

title:: Transition between characters of classical groups, decomposition of Gelfand-Tsetlin patterns & last passage percolation

content:: Elia Bisi (UCD)

:: UCD Probability seminar (http://mathsci.ucd.ie/seminarseries/probability)

location:: Seminar Room SCN 1.25

date-time:: Wed 2nd October 2019 at 2:00PM

UCD School of Mathematical Sciences - Seminar Notice

Speaker: ** Herbert Spohn (TU Munich)**

Title: **Hydrodynamics of the classical Toda chain**

Date: Wed 16th October 2019

Time: 2:00PM

Location: Seminar Room SCN 1.25

Abstract: Over the past four years there have been many activities, mostly on the quantum side, to study the dynamics of integrable many-particle systems at non-zero temperatures. On the Eulerian scale, apparently a universal structure becomes valid. The classical Toda chain will serve as an interesting example in illustrating the advances, in particular through an unexpected connection to random matrix theory.

Further Information

-------------------------------------------------------------

For other seminars in the Probability series, click http://mathsci.ucd.ie/seminarseries/probability

-------------------------------------------------------------

The following formats the above notice so as to be included in the mathdep google calendar

title:: Hydrodynamics of the classical Toda chain

content:: Herbert Spohn (TU Munich)

:: UCD Probability seminar (http://mathsci.ucd.ie/seminarseries/probability)

location:: Seminar Room SCN 1.25

date-time:: Wed 16th October 2019 at 2:00PM

Dear Colleagues,

= Coffee= , tea & biscuits will be available in the School of=C2=A0Mathematics<= /span>=C2=A0& Statistics common room, ground floor,=C2=A0UCD= =C2=A0O'Brien Centre for Science (North)=C2=A0beforehand.

All are welcome. Detai=
ls of the=C2=A0seminar=C2=A0follow.

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

UCD=C2=A0Appli= ed=C2=A0&=C2=A0Computat= ional=C2=A0Mathematics=C2=A0Seminar=C2=A0=C2=A0=C2=A0=C2=A0

= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D

**Speaker:=C2=A0**Lennon O'Naraigh=C2=A0(University C=
ollege Dublin)

**Time:**=C2=A0Monday, 23rd September 2019 at 1pm

<= b>Location:=C2=A01.25 SCN,=C2=A0UCD=C2=A0O'Brien Centre fo= r Science (North)

**Title:**=C2=A0A Geometric Diffuse-Interface Metho=
d for Droplet Spreading

**Abstract:**

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Best wishes,

Barry Wardell

title::=C2=A0UCD=C2=A0ACM=C2=A0= Seminar

date-time:: Monday 23rd September 2019 at 1:00pm

loc= ation:: 1.25 SCN,=C2=A0UCD=C2=A0O'Brien Centre for Science (No= rth)

content::=C2=A0Lennon O'Naraigh=C2=A0(University College Dublin)=C2=A0wi= ll speak on

::=C2=A0A Geometric Diffuse-Interface Method for Drop= let Spreading

UCD=C2=A0Appli= ed=C2=A0&=C2=A0Computat= ional=C2=A0Mathematics=C2=A0Seminar=C2=A0=C2=A0=C2=A0=C2=A0

= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D

<= b>Location:=C2=A01.25 SCN,=C2=A0UCD=C2=A0O'Brien Centre fo= r Science (North)

This paper exploits t=
he theory of geometric gradient flows to introduce an alternative regulariz=
ation of the thin-film equation. The solution properties of this regulariza=
tion are investigated via a sequence of numerical simulations whose results=
lead to new perspectives on thin-film behavior. The new perspectives in la=
rge-scale droplet-spreading dynamics are elucidated by comparing numerical-=
simulation results for the solution properties of the current model with co=
rresponding known properties of three different alternative models. The thr=
ee specific comparisons in solution behavior are made with the slip model, =
the precursor-film method and the diffuse-interface model.

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Best wishes,

Barry Wardell

title::=C2=A0UCD=C2=A0ACM=C2=A0= Seminar

date-time:: Monday 23rd September 2019 at 1:00pm

loc= ation:: 1.25 SCN,=C2=A0UCD=C2=A0O'Brien Centre for Science (No= rth)

content::=C2=A0Lennon O'Naraigh=C2=A0(University College Dublin)=C2=A0wi= ll speak on

::=C2=A0A Geometric Diffuse-Interface Method for Drop= let Spreading

endevent::

Dear All,

David =
Albert, Frederick E. Woodbridge Professor of Philosophy at Columbia =
University, is visiting Trinity next week and will be giving a talk =
on the foundations of quantum mechanics on =
Thursday September 26th:

*=E2=80=98 The Representation of Physical =
Reality in Relativistic Quantum Theories=E2=80=99*

The talk is

David has a PhD in = theoretical physics (Rockefeller University), and in 2015 = was elected a Fellow of the American Academy of Arts & = Sciences. His work has been at the forefront of advances in = the philosophy of physics, particularly in the areas of foundations = of statistical mechanics and quantum mechanics. In addition to = numerous articles (https://www.researchgate.net/scientific-contributions/72982542_Da= vid_Z_Albert), Albert has written several extremely influential = books, including Quantum Mechanics and Experience (1992) and = Time and Chance (2001), Harvard University Press. Albert is known = for his philosphical rigor, and engaging approach.

David is also giving two other talks of a less technical = nature that may also be of interest: a public lecture =E2=80=98The = Problem of the Direction of Time=E2=80=99 , Monday = September 23rd, 7pm, Lecture Room in the Long Room Hub (abstract = below). <https://www.tcd.ie/trinitylongroomhub/whats-on/details/event.php?= eventid=3D131090885> , and a more introductory talk on = quantum mechanics: Wednesday September 25th,4pm to 6pm in Arts = 5025, =E2=80=98The Principle of Locality=E2=80=99 (abstract below).

Best Wishes,

Alison = Fernandes

----------------

Abstracts:

Monday Public = Lecture: The Problem of the Direction of Time

Our everyday = experience of being in the world is swarming with vivid and obvious and = innumerable distinctions between the past and the = future. Paper burns but never un-burns, sugar dissolves in = coffee but never spontaneously separates out of it, we have memories and = records of the past but not of the future, we are convinced that by = acting now we can affect the future but not the past, and so on. = But there seems to be no trace of such a distinction anywhere = in the fundamental microscopic laws of nature. And the tension = between these two facts has been sitting at the heart of our = scientific picture of the world for more than a century now. And = the question of what to make of that tension, and what to do = with that tension, has come to be called the problem of the = direction of time. That problem, and various attempts at solving it, = will be the topic of this talk.

Wednesday Talk: The Principle of Locality

One = of the most basic convictions with which we have always made our way = about in the world =E2=80=93 a conviction I will call The Principle of = Locality - is that nothing that happens here can affect, directly = and instantaneously and without mediation, what happens elsewhere. = I will try to elucidate the meaning and the content and the = enormous intuitive pull of this principle, and to trace it=E2=80=99s = relationship with the history of modern physics - up to and = including it=E2=80=99s astonishing demise in the context of Quantum = Mechanics.

--------

Alison Fernandes

Assistant Professor

Department of Philosophy

Trinity College = Dublin

Abstracts:

Monday Public = Lecture: The Problem of the Direction of Time

Our everyday = experience of being in the world is swarming with vivid and obvious and = innumerable distinctions between the past and the = future. Paper burns but never un-burns, sugar dissolves in = coffee but never spontaneously separates out of it, we have memories and = records of the past but not of the future, we are convinced that by = acting now we can affect the future but not the past, and so on. = But there seems to be no trace of such a distinction anywhere = in the fundamental microscopic laws of nature. And the tension = between these two facts has been sitting at the heart of our = scientific picture of the world for more than a century now. And = the question of what to make of that tension, and what to do = with that tension, has come to be called the problem of the = direction of time. That problem, and various attempts at solving it, = will be the topic of this talk.

Wednesday Talk: The Principle of Locality

One = of the most basic convictions with which we have always made our way = about in the world =E2=80=93 a conviction I will call The Principle of = Locality - is that nothing that happens here can affect, directly = and instantaneously and without mediation, what happens elsewhere. = I will try to elucidate the meaning and the content and the = enormous intuitive pull of this principle, and to trace it=E2=80=99s = relationship with the history of modern physics - up to and = including it=E2=80=99s astonishing demise in the context of Quantum = Mechanics.

--------

Alison Fernandes

Assistant Professor

Department of Philosophy

Trinity College = Dublin

**Content::**<=
o:p>

**MACSI at the =
department of Mathematics and Statistics at the University of Limerick invi=
tes you to a seminar**

** <=
/span>**

** <=
/span>**

**Date:**~~ Monday 23~~^{rd} September
2019, Room A2-002 2p.m.

**Speaker:
Prof. Subhrakanti Dey, Ha=
milton Institute, National University of Ireland, Maynooth**

**Title:**<=
span style=3D"font-size:12.0pt;font-family:"Times New Roman",seri=
f">
Remote estimation over lossy channels in the presence of an eavesdro=
pper

**Abstract: While physical layer security
has become increasingly popular in the wireless communications area, in th=
e context of wireless sensor and actuator networks deployed towards industr=
ial control systems, it remains less explored. As several recent attacks on=
industrial plants and public infrastructure
have shown, achieving secure estimation and control in such systems is ext=
remely important. Recent research has investigated various types of active =
and passive attacks, and design and analysis of relevant defence mechanisms=
in this context, ranging from physical
layer watermarking, detection of data integrity attacks, and various other=
algorithms for enhancing security and privacy in such networks.=
**

In this talk we will =
consider security aspects of remote state estimation in the presence =
of an eavesdropper (a passive attacker), where the
objective is to keep estimates of sensitive data or information secure but=
meaningful. A sensor transmits local state estimates over a packet d=
ropping link to a remote estimator, while an eavesdropper can successfully =
overhear each sensor transmission with
a certain probability. The objective is to determine suitable transmission=
scheduling schemes or design other artefacts such as addition of artificia=
l noise (for example, if the transmitter is equipped with multiple antennas=
), in order to minimize the estimation
error covariance at the remote estimator, while trying to keep the eavesdr=
opper error covariance above a certain level. This is done by solving an op=
timization problem that minimizes a linear combination of the expected esti=
mation error covariance and the
negative of the expected eavesdropper error covariance. Structural results=
on the optimal transmission policy are derived, and shown to exhibit a thr=
esholding behaviour in the estimation error covariances. Furthermore,=
for unstable systems, it is shown that
in the infinite horizon situation there exist transmission policies which =
can keep the expected estimation error covariance bounded at the legitimate=
estimator while the expected eavesdropper error covariance becomes unbound=
ed, thus making it useless. A different
secrecy measure based on an information theoretic security notion will als=
o be investigated.

**Further Info=
rmation**: If you have any questions regarding this seminar, please =
direct them to Dr Romina Gaburro ext 3193, email
romina.gaburro ul.ie

TCD Geometry Seminar (September 25, 2pm and 3pm)

Tw= o talks by Yoshiaki Goto and Saiei-Jaeyeong Matsubara-Heo

----------= ------------------------------------------

TCD Geometry Seminar

Wedne= sday, September 25 at 2:00pm

New Seminar Room, Hamilton Building, TCD

Speaker: Yoshiaki Goto (Otaru University of Commerce)

Title: Co= ntiguity relations for hypergeometric integrals of type (k,n)

Abstra= ct:

There are several generalizations of the Gauss hypergeometric functi= on. The Aomoto-Gelfand hypergeometric function is one of them, which are in= troduced in the view point of integral representations. To study such hyper= geometric integrals, twisted homology and cohomology groups are useful.

= In this talk, I would like to talk about these hypergeometric integrals and= twisted cohomology groups mainly. I will give a short introduction to twis= ted cohomology groups and the intersection form on them, and explain deriva= tions of contiguity relations (difference equation) as their application.&l= t;/td>

----------------------------------------------------

TC= D Geometry Seminar

Wednesday, September 25 at 3:00pm

New Seminar Room= , Hamilton Building, TCD

Speaker: Saiei-Jaeyeong Matsubara-Heo (Kobe= University)

Title: Evaluating cohomology intersection numbers from = twisted period relations

Abstract:

After the pioneering work of K= azuhiko Aomoto in 70's, the study of hypergeometric integrals is now re= garded as a twisted analogue of that of =C2=A0period integrals. Through Poi= ncare duality, it is straightforward to define (co)homology intersection nu= mbers, but their exact evaluation is not an easy problem to solve except fo= r some special integrals such as Aomoto-Gelfand hypergeometric integral.

In this talk, we investigate the possibilities of evaluating cohomology in= tersection numbers (c.i.n.) through the twisted analogue of period relation= s. One way is to characterize the c.i.n. as a solution of differential equa= tions. This part is the joint work with Nobuki Takayama. The other way is t= o expand the c.i.n. at toric infinity which can be obtained by using GKZ hy= pergeometric systems.

----------------------------------------------= ------------------------------

title:: TCD Geometry Seminar 1

content= :: Yoshiaki Goto (Otaru University of Commerce) will speak on

:: Contigu= ity relations for hypergeometric integrals of type (k,n)

:: https://www.maths.tcd.ie/~dmc/

date-t= ime:: Wednesday, September 25 at 2:00pm

location:: New Seminar Room, Ham= ilton Building, TCD

endevent::

title:: TCD Geometry Seminar 2

= content:: Saiei-Jaeyeong Matsubara-Heo (Kobe University) will speak on

:= : Evaluating cohomology intersection numbers from twisted period relations<= br>:: https://www.maths.tcd.ie/~= dmc/

date-time:: Wednesday, September 25 at 3:00pm

location:: New= Seminar Room, Hamilton Building, TCD

endevent::

--00000000000042074a0592fab9c2--
From owner-mathdep LISTSERV.HEANET.IE Fri Sep 20 15:25:25 2019
Return-Path: Tw= o talks by Yoshiaki Goto and Saiei-Jaeyeong Matsubara-Heo

----------= ------------------------------------------

TCD Geometry Seminar

Wedne= sday, September 25 at 2:00pm

New Seminar Room, Hamilton Building, TCD

Speaker: Yoshiaki Goto (Otaru University of Commerce)

Title: Co= ntiguity relations for hypergeometric integrals of type (k,n)

Abstra= ct:

There are several generalizations of the Gauss hypergeometric functi= on. The Aomoto-Gelfand hypergeometric function is one of them, which are in= troduced in the view point of integral representations. To study such hyper= geometric integrals, twisted homology and cohomology groups are useful.

= In this talk, I would like to talk about these hypergeometric integrals and= twisted cohomology groups mainly. I will give a short introduction to twis= ted cohomology groups and the intersection form on them, and explain deriva= tions of contiguity relations (difference equation) as their application.&l= t;/td>

----------------------------------------------------

TC= D Geometry Seminar

Wednesday, September 25 at 3:00pm

New Seminar Room= , Hamilton Building, TCD

Speaker: Saiei-Jaeyeong Matsubara-Heo (Kobe= University)

Title: Evaluating cohomology intersection numbers from = twisted period relations

Abstract:

After the pioneering work of K= azuhiko Aomoto in 70's, the study of hypergeometric integrals is now re= garded as a twisted analogue of that of =C2=A0period integrals. Through Poi= ncare duality, it is straightforward to define (co)homology intersection nu= mbers, but their exact evaluation is not an easy problem to solve except fo= r some special integrals such as Aomoto-Gelfand hypergeometric integral.

In this talk, we investigate the possibilities of evaluating cohomology in= tersection numbers (c.i.n.) through the twisted analogue of period relation= s. One way is to characterize the c.i.n. as a solution of differential equa= tions. This part is the joint work with Nobuki Takayama. The other way is t= o expand the c.i.n. at toric infinity which can be obtained by using GKZ hy= pergeometric systems.

----------------------------------------------= ------------------------------

title:: TCD Geometry Seminar 1

content= :: Yoshiaki Goto (Otaru University of Commerce) will speak on

:: Contigu= ity relations for hypergeometric integrals of type (k,n)

:: https://www.maths.tcd.ie/~dmc/

date-t= ime:: Wednesday, September 25 at 2:00pm

location:: New Seminar Room, Ham= ilton Building, TCD

endevent::

title:: TCD Geometry Seminar 2

= content:: Saiei-Jaeyeong Matsubara-Heo (Kobe University) will speak on

:= : Evaluating cohomology intersection numbers from twisted period relations<= br>:: https://www.maths.tcd.ie/~= dmc/

date-time:: Wednesday, September 25 at 3:00pm

location:: New= Seminar Room, Hamilton Building, TCD

endevent::

Dear colleagues,

The first Mathematics and Statistics Colloquium of the new academic year ta=
kes place next
**Wednesday (25th September)** at the new time of **3pm **in MS2, Log=
ic House on the South Campus of Maynooth University. Details are give=
n below. All are welcome.

Very best wishes,

Ollie.

---------------------------------------------------------------------------=
------------------------------------------

The early modern period witnessed a remarkable change in status for the =
mathematical disciplines. Largely neglected during the Middle Ages and give=
n little weight in the hierarchy of
academic disciplines thereafter, mathematics increasingly came to be seen =
as central to natural philosophy, to the study of the natural world,
*and
*as key to accomplishing useful and practical tasks in the rea=
lms of commerce, navigation, warfare, and land management.

To date, scholarly attention has focussed largely upon the expert theore=
ticians, authors, and producers associated with the discipline=92s re-emerg=
ence. Yet a wider readership of lesser
abilities must also have existed: one served by the various levels of inst=
ruction offered in the workplaces of the guilds and shipyards; at instituti=
ons such as
*scholae triviales*, gymnasia, and universities; v=
ia individual tutoring; and even auto-didactic
reading. This wider audience for mathematical texts has yet to be satisfac=
torily recovered. As a result,
our knowledge of these more quotidian users - the reasons behind their dem=
and for materials,
the ways in which they came to practice mathematic=
s,
and, indeed, their important role in effecting wider changes in t=
his mathematical culture - remains significantly underdeveloped.

To better understand these previously unseen users and their burgeoning = mathematical practice, this paper presents evidence from the Science Museum= Library=92s Rare Books Collection to explore the use, ownership and subsequent collection of mathematical books= produced between 1550 and 1750. Supplemented by macroscopic data on the representativeness of the collection as a whole, g= ranular case-studies detail evidence of the spread of Ramist pedagogies of = arithmetic, geometry, and trigonometry in sixteenth-century Germany; the in= terconnected use of text, instrument and theory in early modern English intellectual and navigational cultures;= and the value attached to the related disciplines of mathematical astronom= y and chronology at the University of Cambridge in the late 1690s.

Concluding with a reconstruction of an individual early modern library a= nd with a discussion on the interplay between individual and institutional = collections, I highlight the changing values attributed to the mathematical text in the pre-modern and modern er= as. By combining the =91scribal technologies=92 and reading practices utili= sed by early modern individuals with the histories of these artefacts as ma= terial objects, this paper sheds further light on the historical culture and experience of mathematical engagement = as seen from the perspective of the user-consumer.

Given a symplectic spread Om= ega, we are interested in those subgroups of Sp(2m,q) that map Omega into i= tself. We are especially interested in such subgroups that additionally act= transitively on the elements of Omega. We will outline how, in many cases= , few subgroups have this property

and = that they essentially arise in the same way.

title:: UCD Algebra and Numbe=
r Theory Seminar

content::=C2=A0Rod Gow=C2=A0(UCD)=C2=A0will speak on

::=C2=A0Finite group actions on vector space spreads

date-time:: Thursd= ay,=C2=A0September 26, 2019 at 2:00pm

content::=C2=A0Rod Gow=C2=A0(UCD)=C2=A0will speak on

::=C2=A0Finite group actions on vector space spreads

date-time:: Thursd= ay,=C2=A0September 26, 2019 at 2:00pm

location::=C2=A0Room 1.25, O=E2=80=99Bri=
en Centre for Science (North)

endevent::

endevent::

HMI Mini-confe=
rence dedicated to the memory of Sir Michael Atiyah

Hamilton Mathema= tics Institute, Trinity College Dublin

September 27, 2019

Mini-co= nference dedicated to the memory of Sir Michael Atiyah who chaired HMI Scie= ntific Advisory Board from 2003 to 2016

Speakers:

Maxim Konts= evich (IHES, France, Fields Medalist 1998)

Andrei Okounkov (Columbia, US= A, Fields Medalist 2006)

Yuri Tschinkel (Courant Institute, NYU and Simo= ns Foundation, USA)

For more information see

https://= www.maths.tcd.ie/~hmi/events/2019-Sep-mini-conf/

Hamilton Mathema= tics Institute, Trinity College Dublin

September 27, 2019

Mini-co= nference dedicated to the memory of Sir Michael Atiyah who chaired HMI Scie= ntific Advisory Board from 2003 to 2016

Speakers:

Maxim Konts= evich (IHES, France, Fields Medalist 1998)

Andrei Okounkov (Columbia, US= A, Fields Medalist 2006)

Yuri Tschinkel (Courant Institute, NYU and Simo= ns Foundation, USA)

For more information see

https://= www.maths.tcd.ie/~hmi/events/2019-Sep-mini-conf/

**Abstract**:=C2=A0Linear dynami=
cs has been a rapidly evolving area since the early 1990s.=C2=A0 It lies at=
the intersection of operator theory and topological dynamics, and its cent=
ral property is hypercyclicity.=C2=A0 In this talk I will give a general in=
troduction to hypercyclicity and the stronger property of frequent hypercyc=
licity, whence I will demonstrate that many natural continuous linear maps =
turn out to possess these properties.

title:: DCU Maths Colloquium

content::=C2=A0=C2=A0Cli=
fford Gilmore (Cork) will speak on

::=C2=A0 =C2=A0 =C2=A0=C2=A0=20
The Dynamics of Linear Operators

date-time:: Wednesday 2nd October, 2019=
at 3pm

location:: XG22, DCU

endevent:=C2=A0 =C2=A0

S=C3=A9anadh R=C3=ADomhphoist/Email Disclaimer=

T=C3=A1 an r=C3=ADomhphost seo agus a= on chomhad a sheoltar leis faoi r=C3=BAn agus is lena =C3=BAs=C3=A1id ag an= seola=C3=AD agus sin amh=C3=A1in =C3=A9. Is f=C3=A9idir tuilleadh a l= =C3=A9amh anseo.=C2=A0

This e-mail and any files transmitted with it are confidential and a= re intended solely for use by the addressee. Read more here.<= /span>=

--00000000000048d1b00593727596-- From owner-mathdep LISTSERV.HEANET.IE Fri Sep 27 11:50:53 2019 Return-Path:

TCD Geometry S=
eminar (September 25, 2pm and 3pm)

Two talks by Yoshiaki Goto and Sa= iei-Jaeyeong Matsubara-Heo

-----------------------------------------= -----------

TCD Geometry Seminar

Wednesday, September 25 at 2:00pm

New Seminar Room, Hamilton Building, TCD

Speaker: Yoshiaki Goto (Ot= aru University of Commerce)

Title: Contiguity relations for hypergeo= metric integrals of type (k,n)

Abstract:

There are several genera= lizations of the Gauss hypergeometric function. The Aomoto-Gelfand hypergeo= metric function is one of them, which are introduced in the view point of i= ntegral representations. To study such hypergeometric integrals, twisted ho= mology and cohomology groups are useful.

In this talk, I would like to t= alk about these hypergeometric integrals and twisted cohomology groups main= ly. I will give a short introduction to twisted cohomology groups and the i= ntersection form on them, and explain derivations of contiguity relations (= difference equation) as their application.</td>

--------------= --------------------------------------

TCD Geometry Seminar

Wednesday= , September 25 at 3:00pm

New Seminar Room, Hamilton Building, TCD

Speaker: Saiei-Jaeyeong Matsubara-Heo (Kobe University)

Title: Eval= uating cohomology intersection numbers from twisted period relations

Abstract:

After the pioneering work of Kazuhiko Aomoto in 70's, the= study of hypergeometric integrals is now regarded as a twisted analogue of= that of =C2=A0period integrals. Through Poincare duality, it is straightfo= rward to define (co)homology intersection numbers, but their exact evaluati= on is not an easy problem to solve except for some special integrals such a= s Aomoto-Gelfand hypergeometric integral.

In this talk, we investigate t= he possibilities of evaluating cohomology intersection numbers (c.i.n.) thr= ough the twisted analogue of period relations. One way is to characterize t= he c.i.n. as a solution of differential equations. This part is the joint w= ork with Nobuki Takayama. The other way is to expand the c.i.n. at toric in= finity which can be obtained by using GKZ hypergeometric systems.

Two talks by Yoshiaki Goto and Sa= iei-Jaeyeong Matsubara-Heo

-----------------------------------------= -----------

TCD Geometry Seminar

Wednesday, September 25 at 2:00pm

New Seminar Room, Hamilton Building, TCD

Speaker: Yoshiaki Goto (Ot= aru University of Commerce)

Title: Contiguity relations for hypergeo= metric integrals of type (k,n)

Abstract:

There are several genera= lizations of the Gauss hypergeometric function. The Aomoto-Gelfand hypergeo= metric function is one of them, which are introduced in the view point of i= ntegral representations. To study such hypergeometric integrals, twisted ho= mology and cohomology groups are useful.

In this talk, I would like to t= alk about these hypergeometric integrals and twisted cohomology groups main= ly. I will give a short introduction to twisted cohomology groups and the i= ntersection form on them, and explain derivations of contiguity relations (= difference equation) as their application.</td>

--------------= --------------------------------------

TCD Geometry Seminar

Wednesday= , September 25 at 3:00pm

New Seminar Room, Hamilton Building, TCD

Speaker: Saiei-Jaeyeong Matsubara-Heo (Kobe University)

Title: Eval= uating cohomology intersection numbers from twisted period relations

Abstract:

After the pioneering work of Kazuhiko Aomoto in 70's, the= study of hypergeometric integrals is now regarded as a twisted analogue of= that of =C2=A0period integrals. Through Poincare duality, it is straightfo= rward to define (co)homology intersection numbers, but their exact evaluati= on is not an easy problem to solve except for some special integrals such a= s Aomoto-Gelfand hypergeometric integral.

In this talk, we investigate t= he possibilities of evaluating cohomology intersection numbers (c.i.n.) thr= ough the twisted analogue of period relations. One way is to characterize t= he c.i.n. as a solution of differential equations. This part is the joint w= ork with Nobuki Takayama. The other way is to expand the c.i.n. at toric in= finity which can be obtained by using GKZ hypergeometric systems.

HMI Mini-conference dedicated to the memory of Sir Michael=
Atiyah

Hamilton Mathematics Institute, Trinity College Dublin

Se= ptember 27, 2019

Mini-conference dedicated to the memory of Sir Mich= ael Atiyah who chaired HMI Scientific Advisory Board from 2003 to 2016

<= br>Speakers:

Maxim Kontsevich (IHES, France, Fields Medalist 1998)

An= drei Okounkov (Columbia, USA, Fields Medalist 2006)

Yuri Tschinkel (Cour= ant Institute, NYU and Simons Foundation, USA)

Location:

Maxwell = Theatre (10:30-13:00), Hamilton Building

Salmon Theatre (14:30-17:00), H= amilton Building

For more information see

https://www.maths.tcd.ie/~hmi= /events/2019-Sep-mini-conf/

--000000000000ecc5c30593758f30--
From owner-mathdep LISTSERV.HEANET.IE Fri Sep 27 11:56:02 2019
Return-Path: Hamilton Mathematics Institute, Trinity College Dublin

Se= ptember 27, 2019

Mini-conference dedicated to the memory of Sir Mich= ael Atiyah who chaired HMI Scientific Advisory Board from 2003 to 2016

<= br>Speakers:

Maxim Kontsevich (IHES, France, Fields Medalist 1998)

An= drei Okounkov (Columbia, USA, Fields Medalist 2006)

Yuri Tschinkel (Cour= ant Institute, NYU and Simons Foundation, USA)

Location:

Maxwell = Theatre (10:30-13:00), Hamilton Building

Salmon Theatre (14:30-17:00), H= amilton Building

For more information see

https://www.maths.tcd.ie/~hmi= /events/2019-Sep-mini-conf/

Tuesday 1st October=
2019=C2=A0 at 3.00pm=C2=A0 (place: UCD=C2=A0 Science North 125 )

Speaker:=C2=A0 Clifford Gilmore (UCC)

Title: Distributionally Chaotic Functions

The order of growth of distributionally chaotic entire functions was first=20 considered by Bernal and Bonilla (2016).=C2=A0 In this talk we examine rece= nt results on the permissible growth rates of entire and harmonic=20 functions that are distributionally chaotic with respect to=20 differentiation operators. =C2=A0

This is joint work with A. Peris a= nd F. Martnez-Gimenez (Universitat Politecnica de Valencia). <= span>

title:: ANALYSIS SEMINAR

content:: C. Gilmore=C2=A0 will speak on
::=C2=A0 About Distributionally Chaotic Functions

date-time:: Tuesday 1st=C2=A0 October, 2019=C2=A0 at 3.00pm location:: UCD=C2=A0 Science North 125

endevent::

<=
table class=3D"gmail-cf gmail-gJ" cellpadding=3D"0">

Tuesday 1st October 2019=C2=A0 at 3.00pm=C2=A0 (place=
: UCD=C2=A0 Science North 125 )

Speaker:=C2=A0 Cli=
fford Gilmore (UCC)

Title: Distributionally Chaotic Functions

= The order of growth of distributionally chaotic entire functions was first = considered by Bernal and Bonilla (2016).=C2=A0 In this talk we examine rece= nt results on the permissible growth rates of entire and harmonic functions= that are distributionally chaotic with respect to differentiation operator= s. =C2=A0

This is joint work with A. Peris and F. Martnez-Gimenez (U= niversitat Politecnica de Valencia).

title:: ANALYSIS SEMINA=
R

content:: C. Gilmore=C2=A0 will speak on
::=C2=A0 About Distributionally Chaotic Functions

date-time:: Tuesday 1st=C2=A0 October, 2019=C2=A0 at 3.00pm location:: UCD=C2=A0 Science North 125

endevent::

**Content:
**

Please Note: The seminar will take place on
__Thursday the 26 ^{th}__ at the usual time 4-5pm.

**MACSI at the =
department of Mathematics and Statistics at the University of Limerick invi=
tes you to a seminar**

** <=
/span>**

** <=
/span>**

**Date:**~~ Thursday 26~~^{th} September =
2019,
Room A2-002 4p.m.

**Speaker: Alessio Benavoli, Senior
Lecturer at CSIS, http://alessiobenavoli.com/**

**Title:**<=
span style=3D"font-size:12.0pt;font-family:"Times New Roman",seri=
f">
Rationality and computational rationa=
lity in the age of AI.

**Abstract: Artificial intelligence
(AI) and Machine Learning research is revolutionising our lives and leadin=
g us to a world with self-driving cars, automated trading on stock exchange=
s etc.. Such applications require AI methods to be able to make rational ch=
oices and make robust decisions.
Rationality means that an AI agent is assumed to take account of available=
information and uncertainty, potential costs and benefits, and to act cons=
istently (logically) in choosing the best action. Robustness in decision ma=
king is required to both the known
unknowns (the uncertainty in the world about which the agent can reason ex=
plicitly) and the unknown unknowns (unmodelled aspects).
**

However, the current =
methods are not sufficiently suited to address these issues. In this semina=
r,

I will briefly discus=
s the pitfalls of "general-recipe" machine learning (from a stati=
stics point of view) and then introduce probabilistic (Bayesian)
machine learning from a Von Neumann–Morgenstern perspective: "a=
rational AI agent maximises their expected utility".

I will briefly discus=
s about a general framework to model rationality, that encompasses differen=
t definitions of rationality from decision/market/game
theory like no-Dutch-book, no-arbitrage, Nash-equilibrium theorems. Finall=
y I will discuss computational rationality, that is about identifying decis=
ions with highest expected utility, while taking into consideration the cos=
ts of computation in complex real-world
problems in which most relevant calculations can only be approximated.

In other words, how c=
an an AI agent make rational decisions when their computational power and c=
omputational time is limited? How can we formalize
a theory of computational rationality? How does Nature solve this problem?=

**Further Information**:
If you have any questions regarding this seminar, please direct them to Rom=
ina Gaburro (061 2131930, email romina.gaburro ul.ie o=
r Clifford Nolan (061 202766), __clifford.nola=
n ul.ie__).

Dear All,

David =
Albert, Frederick E. Woodbridge Professor of Philosophy at Columbia =
University, is visiting Trinity next week and will be giving a talk =
on the foundations of quantum mechanics on Thursday September 26th:

*=E2=80=98 The Representation of Physical Reality in Relativistic =
Quantum Theories=E2=80=99*

The talk is

David has a PhD in = theoretical physics (Rockefeller University), and in 2015 = was elected a Fellow of the American Academy of Arts & = Sciences. His work has been at the forefront of advances in = the philosophy of physics, particularly in the areas of foundations = of statistical mechanics and quantum mechanics. In addition to = numerous articles (https://www.researchgate.net/scientific-contributions/72982542_= David_Z_Albert), Albert has written several extremely = influential books, including Quantum Mechanics and = Experience (1992) and Time and Chance (2001), Harvard = University Press. Albert is known for his philosphical rigor, and = engaging approach.

David is also = giving two other talks of a less technical nature that may also be = of interest: a public lecture =E2=80=98The Problem of the Direction = of Time=E2=80=99 , Monday September 23rd, 7pm, Lecture Room in = the Long Room Hub (abstract below). <https://www.tcd.ie/trinitylongroomhub/whats-on/details/event.ph= p?eventid=3D131090885> , and a more introductory talk on = quantum mechanics: Wednesday September 25th,4pm to 6pm in Arts = 5025, =E2=80=98The Principle of Locality=E2=80=99 (abstract below).

Best Wishes,

Alison = Fernandes

----------------

Abstracts:

Monday Public = Lecture: The Problem of the Direction of Time

Our everyday = experience of being in the world is swarming with vivid and obvious and = innumerable distinctions between the past and the = future. Paper burns but never un-burns, sugar dissolves in = coffee but never spontaneously separates out of it, we have memories and = records of the past but not of the future, we are convinced that by = acting now we can affect the future but not the past, and so on. = But there seems to be no trace of such a distinction anywhere = in the fundamental microscopic laws of nature. And the tension = between these two facts has been sitting at the heart of our = scientific picture of the world for more than a century now. And = the question of what to make of that tension, and what to do = with that tension, has come to be called the problem of the = direction of time. That problem, and various attempts at solving it, = will be the topic of this talk.

Wednesday Talk: The Principle of Locality

One = of the most basic convictions with which we have always made our way = about in the world =E2=80=93 a conviction I will call The Principle of = Locality - is that nothing that happens here can affect, directly = and instantaneously and without mediation, what happens elsewhere. = I will try to elucidate the meaning and the content and the = enormous intuitive pull of this principle, and to trace it=E2=80=99s = relationship with the history of modern physics - up to and = including it=E2=80=99s astonishing demise in the context of Quantum = Mechanics.

--------

Alison Fernandes

Assistant Professor

Department of Philosophy

Trinity College = Dublin

Abstracts:

Monday Public = Lecture: The Problem of the Direction of Time

Our everyday = experience of being in the world is swarming with vivid and obvious and = innumerable distinctions between the past and the = future. Paper burns but never un-burns, sugar dissolves in = coffee but never spontaneously separates out of it, we have memories and = records of the past but not of the future, we are convinced that by = acting now we can affect the future but not the past, and so on. = But there seems to be no trace of such a distinction anywhere = in the fundamental microscopic laws of nature. And the tension = between these two facts has been sitting at the heart of our = scientific picture of the world for more than a century now. And = the question of what to make of that tension, and what to do = with that tension, has come to be called the problem of the = direction of time. That problem, and various attempts at solving it, = will be the topic of this talk.

Wednesday Talk: The Principle of Locality

One = of the most basic convictions with which we have always made our way = about in the world =E2=80=93 a conviction I will call The Principle of = Locality - is that nothing that happens here can affect, directly = and instantaneously and without mediation, what happens elsewhere. = I will try to elucidate the meaning and the content and the = enormous intuitive pull of this principle, and to trace it=E2=80=99s = relationship with the history of modern physics - up to and = including it=E2=80=99s astonishing demise in the context of Quantum = Mechanics.

--------

Alison Fernandes

Assistant Professor

Department of Philosophy

Trinity College = Dublin

= --Apple-Mail=_EE62324B-9C4E-45BB-AA39-A1FAF1CC3E11-- From owner-mathdep LISTSERV.HEANET.IE Fri Sep 27 11:59:58 2019 Return-Path:

Speaker: ** Wayne G. Sullivan (UCD)**

Title: **Large Deviations for Finite Alphabet Shift Spaces**

Date: Wed 9th October 2019

Time: 2:00PM

Location: Seminar Room SCN 1.25

Abstract: A brief discussion of large deviations in the context of finite alphabet

shift spaces is given. From the infinite coin-flip model we introduce

topological pressure and entropy, equilibrium states, subshifts of

finite type, entropy of a shift-invariant measure, entropy density,

weak Gibbs measures and functions with bounded total oscillations. We

then state a recent result by C-E Pfister and WG Sullivan about large

deviations for spaces which satisfy decoupling, an extension of a concept

of Ruelle.

Further Information

-------------------------------------------------------------

For other seminars in the Probability series, click http://mathsci.ucd.ie/seminarseries/probability

-------------------------------------------------------------

The following formats the above notice so as to be included in the mathdep google calendar

title:: Large Deviations for Finite Alphabet Shift Spaces

content:: Wayne G. Sullivan (UCD)

:: UCD Probability seminar (http://mathsci.ucd.ie/seminarseries/probability)

location:: Seminar Room SCN 1.25

date-time:: Wed 9th October 2019 at 2:00PM

UCD School of Mathematics and Statistics - Seminar Notice

Speaker: ** Jeremiah Buckley (King's College London)
**

Title: **Fluctuations in the zeroes of stationary Gaussian processes
**

Date: Wed 30th October 2019

Time: 2:00PM

Location: Seminar Room SCN 1.25

Abstract: The zeroes of a stationary Gaussian process on the real line are a classical object, and the mean number of zeroes is given by the famous Kac-Rice formula. A formula in a similar spirit, due to Cram\'{e}r-Leadbetter ('65), computes the variance exactly. Unfortunately this expression is quite involved, and it is difficult to extract a good estimate for the size of the variance. This meant that most of the early CLTs proved in this area contained a growth condition that was more or less impossible to check. Subsequently Slud ('91) proved that if the covariance function and its second derivative are square integrable, then the variance grows linearly with the length of the interval. We will propose an approximate formula for a general process, that computes the asymptotic growth of the variance. In particular we show that the variance always grows at least linearly for a non-trivial process, as well as recovering Slud's result. Work in progress with Era
n Assaf and Naomi Feldheim.

Further Information

-------------------------------------------------------------

For other seminars in the Probability series, click http://maths.ucd.ie/seminarseries/probability

-------------------------------------------------------------

The following formats the above notice so as to be included in the mathdep google calendar

title:: Fluctuations in the zeroes of stationary Gaussian processes

content:: Jeremiah Buckley (King's College London)

:: UCD Probability seminar (http://maths.ucd.ie/seminarseries/probability)

location:: Seminar Room SCN 1.25

date-time:: Wed 30th October 2019 at 2:00PM

The Irish Centre of High End =
Computing will hold a 1-day introductory course on Julia for Scientific =
computing at NUI Galway on the 6th of November. This =
event is supported by the de Br=C3=BAn =
Centre for Mathematics and the Discipline of Mechanical =
Engineering. Julia (www.julialang.org) is a new language which aims to =
solve the two language problem of scientific computing (writing =
prototype code in one language (Matlab/Python) and production =
performant code in another (Fortran/C/Cython). With Julia, it =
is possible to do this all in the one language and get the speed of a =
low level language like C with the flexibility and ease of use of =
Matlab/Python. It is still relatively young for a language but has =
reached its first stable release and is starting to be adopted more =
widely across industry and academia. This course aims to introduce users =
to Julia, demonstrate its main features and provide enough instruction =
to get up and running with it.

Participation in the course is free of charge. Registrations = will be accepted on a first-come, first-served = basis.

Participants can register =
at:

https://www.eventbrite.com/e/the-julia-programming-language-tic=
kets-74221507527&&&&&&&&&&&&&&a=
mp;&&&&&&&&&&&&&&&=
amp;&

title:: Julia for =
scientific computing

content:: ICHEC

date-time:: 6th November 2019 at 9:30am

location:: CA107 Aras Cairnes, NUIG, Galway

endevent::

content:: ICHEC

date-time:: 6th November 2019 at 9:30am

location:: CA107 Aras Cairnes, NUIG, Galway

endevent::

= --Apple-Mail=_93297B26-8DB1-4F54-99E4-D44DA747BB3D-- From owner-mathdep LISTSERV.HEANET.IE Fri Sep 27 17:23:23 2019 Return-Path:

Dear Colleagues,

<=
font size=3D"-1">The next=C2=
=A0seminar=C2=A0in the=C2=A0UCD=C2=A0=
Applied=C2=A0and=C2=A0Computational =C2=A0Maths=C2=A0Seminar=
=C2=A0S=
eries <http://maths.uc=
d.ie/ACMSeminars/=
> will take place on Monday, 30th September at 1pm.

= Coffee, tea & biscuits will be available in the S= chool of=C2=A0Mathematics=C2=A0& S= tatistics common room, ground floor,=C2=A0UCD= =C2=A0O'Brien Centre for Science (North)=C2=A0beforehand.

= Coffee, tea & biscuits will be available in the S= chool of=C2=A0Mathematics=C2=A0& S= tatistics common room, ground floor,=C2=A0UCD= =C2=A0O'Brien Centre for Science (North)=C2=A0beforehand.

All are welcome=
. Details of the=C2=A0seminar=C2=A0=
follow.

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D

UCD=C2=A0Applied=C2=A0&=C2=A0Computational= =C2=A0Mathematics=C2=A0Seminar=C2=A0=C2=A0=C2=A0=C2=A0

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

**Speaker:=C2=A0**Cathal Cummins=C2=
=A0(Heriot-Watt University/Maxwell Institute)

**Time:**=C2=A0Monday, =
30th September 2019 at 1pm

**Location:=C2=A0**1.25 SCN,=C2=A0UCD=C2=A0O'Brien Centre for Science (North=
)

**Title:**=C2=A0A separated vortex ring underlies the flight of the=
Jinny Joe

**Abstract:**

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Best wishe= s,

Barry Wardell

t= itle::=C2=A0UCD=C2=A0ACM=C2=A0Seminar

dat= e-time:: Monday 30th September 2019 at 1:00pm

location:: 1.25 SCN,=C2=A0= UCD=C2=A0O'Brien Centre for Scienc= e (North)

content::=C2=A0Cathal Cummins (Heriot-Watt University/Maxwell Institute)=C2=A0will= speak on

::=C2=A0A separated vortex ring underlies the flight of= the Jinny Joe

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D

UCD=C2=A0Applied=C2=A0&=C2=A0Computational= =C2=A0Mathematics=C2=A0Seminar=C2=A0=C2=A0=C2=A0=C2=A0

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Large (macro) bodies, such as=
whales and bumblebees, move about using thin membranes (fins and wings etc=
.). Very small (micro) bodies, such as spermatozoa, use slender filaments f=
or movement. At the macroscale, locomotion is achieved by imparting momentu=
m to the surrounding fluid. At the microscale, such a strategy would be foi=
led by large viscous drag forces; hence, locomotion is achieved by exploiti=
ng drag forces. At some lengthscale, there is a shift from using thin membr=
anes to using hairs to move. In this talk, we will explore the hydrodynamic=
basis of locomotion in this "mesoscale" realm, with the common d=
andelion fruit (Jinny Joe) as our tour guide.

Best wishe= s,

Barry Wardell

t= itle::=C2=A0UCD=C2=A0ACM=C2=A0Seminar

dat= e-time:: Monday 30th September 2019 at 1:00pm

location:: 1.25 SCN,=C2=A0= UCD=C2=A0O'Brien Centre for Scienc= e (North)

content::=C2=A0Cathal Cummins (Heriot-Watt University/Maxwell Institute)=C2=A0will= speak on

::=C2=A0A separated vortex ring underlies the flight of= the Jinny Joe

endevent::

UCD School of Mathematics and Statistics - Seminar Notice

Speaker: ** Guillaume Barraquand (ENS, Paris)
**

Title: **Diffusions in random environment
**

Date: Wed 23rd October 2019

Time: 2:00PM

Location: Seminar Room SCN 1.25

Abstract: We will consider the effect of adding a space-time white noise drift to a collection of independent Brownian motions. Using an integrable discretization of the model, a random walk in Beta distributed random environment, we will see that the extreme value behavior for these diffusions/random walks is governed by the Kardar-Parisi-Zhang universality class instead of classical extreme value theory. This talk is based on joint works with Ivan Corwin and Mark Rychnovsky.

Further Information

-------------------------------------------------------------

For other seminars in the Probability series, click http://maths.ucd.ie/seminarseries/probability

-------------------------------------------------------------

The following formats the above notice so as to be included in the mathdep google calendar

title:: Diffusions in random environment

content:: Guillaume Barraquand (ENS, Paris)

:: UCD Probability seminar (http://maths.ucd.ie/seminarseries/probability)

location:: Seminar Room SCN 1.25

date-time:: Wed 23rd October 2019 at 2:00PM

title:: UCD Algebra and Number Theory=
Seminar

content::=C2=A0Paul Beirne (UCD)=C2=A0will speak on

::=C2=A0= Knot invariants and coefficient stability

date-time:: Thursday,=C2=A0October 3, 2019 at 2:00pm

content::=C2=A0Paul Beirne (UCD)=C2=A0will speak on

::=C2=A0= Knot invariants and coefficient stability

date-time:: Thursday,=C2=A0October 3, 2019 at 2:00pm

location::=
=C2=A0Room 1.=
25, O=E2=80=99Brien Centre for Science (North)

endevent::

endevent::

Content::

Please Note: The seminar w=
ill take place on THURSDAY the 3^{rd} of October at 4-5 pm.<=
span style=3D"font-size:12.0pt;font-family:"Times New Roman",seri=
f;color:red;mso-fareast-language:EN-IE">

**MACSI at the =
department of Mathematics and Statistics at the University of Limerick invi=
tes you to a seminar**

** <=
/span>**

**Date:**~~ Thursday 3rd October 2019, Room
A2-002 4p.m.~~

**Speaker: Alessio Benavoli, Senior
Lecturer at CSIS, http://alessiobenavoli.com/**

**Title:**<=
span style=3D"font-size:12.0pt;font-family:"Times New Roman",seri=
f">
Rationality and computational rationa=
lity in the age of AI.

**Abstract: Artificial intelligence
(AI) and Machine Learning research is revolutionising our lives and leadin=
g us to a world with self-driving cars, automated trading on stock exchange=
s etc.. Such applications require AI methods to be able to make rational ch=
oices and make robust decisions.
Rationality means that an AI agent is assumed to take account of available=
information and uncertainty, potential costs and benefits, and to act cons=
istently (logically) in choosing the best action. Robustness in decision ma=
king is required to both the known
unknowns (the uncertainty in the world about which the agent can reason ex=
plicitly) and the unknown unknowns (unmodelled aspects).
**

However, the current =
methods are not sufficiently suited to address these issues. In this semina=
r,

I will briefly discus=
s the pitfalls of "general-recipe" machine learning (from a stati=
stics point of view) and then introduce probabilistic (Bayesian)
machine learning from a Von Neumann–Morgenstern perspective: "a=
rational AI agent maximises their expected utility".

I will briefly discus=
s about a general framework to model rationality, that encompasses differen=
t definitions of rationality from decision/market/game
theory like no-Dutch-book, no-arbitrage, Nash-equilibrium theorems. Finall=
y I will discuss computational rationality, that is about identifying decis=
ions with highest expected utility, while taking into consideration the cos=
ts of computation in complex real-world
problems in which most relevant calculations can only be approximated.

In other words, how c=
an an AI agent make rational decisions when their computational power and c=
omputational time is limited? How can we formalize
a theory of computational rationality? How does Nature solve this problem?=

**Further Info=
rmation**: If you have any questions regarding this seminar, please =
direct them to Dr Romina Gaburro ext 3193, email
romina.gaburro ul.ie
or Dr Clifford Nolan (061 202766), __clif=
ford.nolan ul.ie__).

Time: Wednesday, 2nd of October at 16:00

Location: Synge Theatre, Hamilton Building, TCD

Speaker: Carlo Meneghelli (University of = Oxford)

Title: = "Free field realizations from the Higgs Branch"

Abstract:

To = any four-dimensional N=3D2 super-conformal field theory (SCFT) one can = canonically associate a two-dimensional vertex operator = algebra (VOA). This provides a powerful framework for the analysis = of SCFTs and leads to surprising predictions for a large new class of = VOAs. In this talk I will present remarkable free field realizations of = the relevant VOAs which mirror the effective field theory = description of the corresponding four dimensional theory on the Higgs = branch of its moduli space of vacua.

All are welcome!= --Apple-Mail=_37A6E9A3-3E11-40B0-8B1D-878FFE62563B-- From owner-mathdep LISTSERV.HEANET.IE Mon Sep 30 11:13:19 2019 Return-Path:

Dear colleagues,

We will have Mathematical Finance semi= nar on Friday (4th October).

Everybody welcome,

Ryan

title:: = DCU Math Finance (David Edelman, UCD)

content:: Title of talk: Long-term= Investing with minimal Regret

:: A method of long-term portfolio manage= ment with Minimax Regret with respect to

:: the best hindsight constant= -mix (BHCM) portfolio is presented. This is achieved via a BHCM derivative = contract,

:: where several approaches for pricing and hedging such a de= rivative are exhibited.

:: A set of Empirical comparisons with more tra= ditional approaches using pension data from the US and Germany are presente= d.

:: For the data examined, the resulting comparison demonstrates the = superiority of the Minimax-based approach :: over the traditional from the = point of view of both long-term cumulative performance and risk profile.

=C2=A0

date-time:: 4th October at 11:00am

location:: DCU Business Sc= hool, QG21

--

=

We will have Mathematical Finance semi= nar on Friday (4th October).

Everybody welcome,

Ryan

title:: = DCU Math Finance (David Edelman, UCD)

content:: Title of talk: Long-term= Investing with minimal Regret

:: A method of long-term portfolio manage= ment with Minimax Regret with respect to

:: the best hindsight constant= -mix (BHCM) portfolio is presented. This is achieved via a BHCM derivative = contract,

:: where several approaches for pricing and hedging such a de= rivative are exhibited.

:: A set of Empirical comparisons with more tra= ditional approaches using pension data from the US and Germany are presente= d.

:: For the data examined, the resulting comparison demonstrates the = superiority of the Minimax-based approach :: over the traditional from the = point of view of both long-term cumulative performance and risk profile.

=C2=A0

date-time:: 4th October at 11:00am

location:: DCU Business Sc= hool, QG21

--

Kwok Chuen Wong, Ryan

Assistant Professor in Financial = Mathematics

School of Mathematic= al Sciences, Dublin City University

Email: kwokchuen.wong dcu.ieAssistant Professor in Financial = Mathematics

School of Mathematic= al Sciences, Dublin City University

X136, Lonsdale Bui=
lding, Dublin City University, Glasnevin, Dublin 9, Ireland

Tel: +353 1 7005291Dea= r All,

We w= ill have a seminar Thursday (Oct 3) at 4pm in ADB1020.

Coffee/tea/cakes/biscuits will be served in ADB-G022 from 3:30.

=C2= =A0

Aisl= ing McCluskey

from= NUIG

will= speak on

=C2= =A0

=E2= =80=9CCharacterising closed subsets of the reals=E2=80=9D

Abst= ract: =C2=A0The real line is surely one of the most familiar and fundamental sets in mathematics, and= yet there are still aspects of its structure that warrant investigation. Its cl= osed sets are the building blocks of its topology =E2=80=93 but what are they? I= n this general talk, I outline a somewhat surprising characterisation of the close= d subsets of R.

=C2= =A0

Cont= act: Michael Mc Gettrick

=C2= =A0

=C2= =A0

Hopi= ng to see you all there,

=C2= =A0

Haix= uan and Michael

=C2= =A0

Futu= re seminars are listed at=C2=A0http://www.nuigalway.ie/science/school-of-maths/s= eminars/

S=C3=A9anadh R=C3=ADomhphoist/Email Disclaimer=

T=C3=A1 an r=C3=ADomhphost seo agus a= on chomhad a sheoltar leis faoi r=C3=BAn agus is lena =C3=BAs=C3=A1id ag an= seola=C3=AD agus sin amh=C3=A1in =C3=A9. Is f=C3=A9idir tuilleadh a l= =C3=A9amh anseo.=C2=A0

This e-mail and any files transmitted with it are confidential and a= re intended solely for use by the addressee. Read more here.<= /span>=

--000000000000d951f10593c3a46e-- From owner-mathdep LISTSERV.HEANET.IE Mon Sep 30 12:47:15 2019 Return-Path:

Dear All,<= /p>

We will have an online seminar t=
oday (Tuesday 1/9/2020) in NUI Galway=C2=A0** at 2pm**=C2=A0at=C2=A0

https://zoom.us/j/94=
474508852?pwd=3DRW5USjNnT2ZvYmJ1K0pHaWJNdW1MZz09

As part of her viva, Hannah Conroy Broderick=C2=A0

from NUI Galway will speak on<= /p>

"**=
Wrinkles and waves in soft dielectric plates**"

=C2=A0

Abstract:

Soft dielec=
tric materials are smart materials that deform in the presence of an electr=
ic field. They have potential promising applications in devices such as art=
ificial muscles and soft robotics, where there is great demand for material=
s that can undergo repeated large deformations.=C2=A0

In principle, large deformations =
can be obtained by exploiting the so-called snap-through instability. Howev=
er, this phenomenon is difficult to achieve and control in practice, as the=
material often fails due to electric breakdown, or due to wrinkles appeari=
ng on the surface of the material. Here we study in turn the stability of v=
oltage and charge-controlled soft dielectric plates. We investigate Hessian=
and geometric instability modes. We find that voltage-controlled dielectri=
cs can wrinkle in compression and extension, whereas charge-controlled diel=
ectrics can only wrinkle in compression. We find that charge-controlled act=
uation is more stable than voltage-controlled actuation.

Studies on waves in dielectric=
materials suggest the possibility of controlling the wave velocity by appl=
ying an appropriate electric field. This paves the way for applying acousti=
c non-destructive evaluation techniques to dielectric plates, a technique a=
lready used in purely elastic materials. Here we study Lamb wave propagatio=
n in dielectric plates subject to electrical and mechanical loadings. We lo=
ok at the effects of the pre-stress, the electric field and the strain-stif=
fening on the wave characteristics.

This work relies on theoretical and numerical treat=
ments, using the multiphysics theory of nonlinear electro-elasticity, the i=
ncremental theory of small deformations and motions superposed on a large a=
ctuation, the Stroh formalism, the numerical resolution of boundary-value p=
roblems, and Finite Element simulations.=C2=A0

<=
/p>

Contact: Michel Destrade<= br>

Hoping to see you all there,

Haixuan and Michael

<= font color=3D"#1f497d" face=3D"Calibri, sans-serif">Please do join us in the online coffee room from 30 minutes in= advance of the seminar at

https://eu.bbcollab.com/guest/a077c3d41dc34f72a3834c3764=
c86f46

Future seminars are listed at=C2=A0http://www.nuigalway.ie/sc= ience/school-of-maths/seminars/

We are currently attempting to fill two 8-month contract tutor po=
sitions at Maynooth University, one to develop online resources and the oth=
er to oversee and provide help to
undergraduate study groups.

The closing date for both is 13 September 2020, and the appointme=
nts are expected to be effective from 28 Sep 2020. Details are available at=

At that link, choose "External applicants", and then enter either=
007001 (Online Resources Developer) or 007002 (Study Group Tutor) in the v=
acancy ID box to get details for these jobs.

Note that the closing date is next week, and that these positions are separ=
ate from the 9-month tutor position that I announced last week.

Dear all,

I am passing on the following inf=
ormation from Dr Alan Rogerson (alan cdnalma.poznan.pl).

a) The 16th International Conference of The Mathematics Education=
for the Future Project 'Building on the Past to Prepare for the Future' is=
scheduled to take place in King's
College Cambridge, UK, in July 2021 (Covid-19 permitting) https://directorymath=
sed.net/kings-conference/.

b) Dr Rogerson is also offering '*all teachers world-wide free access
to DQME** **an
enormous resource of 4650** **original, stimulating and
motivating maths problems/worksheets/applications developed and written by=
teachers and tested and retested in schools in 11 countries in 10 language=
s over the six year period of the EU funded DQME Projects I and II'. *

There will be no further posts to=
this mailing list about these items from me, so if you want to be kept inf=
ormed please contact Dr Rogerson directly.

Kind regards,

Ciar=E1n

Dr. Ciar=E1n Mac an Bhaird

Assistant Professor and MSC = Director

Department of Mathematics an= d Statistics

Maynooth University

https://ww=
w.maynoothuniversity.ie/people/ciar-n-mac-bhaird

http://supportcentre.maths.nuim.i=
e/

Sad news about Sir Vaugh=
an F.R. Jones.

Vaughan Jones died =
suddenly on September 6, at age 67, from health complications resulting fro=
m a severe ear infection. People may refer to the official
announcement by Vanderbilt University:

https://news.vanderbilt.edu/2020/09/09/vaughan-jones-preeminent-van=
derbilt-mathematician-has-died/

-----------------------------------------=
----------------------------------------

Dr Martin Mathieu, MRIA

Mathematical Sciences Research Centre

School of Mathematics and Physics

Queen’s University Belfast

Belfast BT7 1NN

Northern Ireland

E-mail
m.m qub.ac.uk<=
/span>

URL
http=
://maths.martinmathieu.net

Tel +44 28 9097 1321

Fax +44 28 9097 1541

Mob +44 7976 758908

UCD School of Mat= hematics and Statistics - Seminar Notice

Speaker:Pe= rsi Diaconis (Stanford)

Title:Finite Fields Meet Markov Chains

=

Date: Thu 1st October 2020

Time: 2:00PM

=

Location: Online

Abstract: Let $p$ be a prime. Cons= ider a random walk on $F(p)$ that moves from $j$ to $j^2 +1$ or $j^2-1$ wit= h probability 1/2 (the square and add Markov chain). It is an open problem = to analyze this simple-sounding scheme. We don't even know the support = of the stationary distribution. When $p \equiv 3$ (mod 4) Jimmy He has dete= rmined the stationary distribution but this is open for $p\equiv 1$ (mod 4)= . Squaring is an automorphism for a field of characteristic $2$ and, with H= e and Marty Isaacs we study the `square and add' chain over $F(2^d)$. F= or some choice of generators, we can show that $(1/2)d \log d$ steps are ne= cessary and sufficient for mixing BUT the generating set seems to matter an= d many mysteries remain. This mix of algebra and probability poses simple t= o state open problems.

Zoom Link: https://ucd-ie.zoom.us/j/95= 697362979?pwd=3DU2k2L2VuZ1RVd2NmWldQTEt5VFFLZz09Zoom Password: <= /font>691

------------= -------------------------------------------------

For other seminars= in the Algebra and Number Theory series, see http://maths.ucd.ie/seminarseries/Algebra

-------= ------------------------------------------------------

The following= formats the above notice so as to be included in the mathdep google calend= ar

title:: Finite Fields Meet Markov Chains

content::= Persi Diaconis (Stanford)

:: UCD Algebra and Number Theory seminar= (http://maths.ucd.ie/seminarseries/Alg= ebra)

location:: Online

date-time:: Thu 1st October 2020= at 2:00PM

=C2=A0The Roy=
al Irish Academy presents

The Hamilton Lecture 2020,

=E2=80=98The Cosmic Distance Ladder=E2=80=99__<=
/u>__

__by Professor Terence Tao, UCLA__

__=C2=A0__

__Friday, 16 October 202=
0 at 4.00 p.m.__

__Register now:=C2=A0<=
/span>ria.ie/events__

__Email your ques=
tions for Terry to=C2=A0hamilton ria.ie=C2=A0by 12:00 on Friday 2 Octob=
er__

__=C2=A0__

Profes=
sor Tao will be joining the chair, Pauline Mellon, Associate Professor at U=
CD and President of Irish Mathematical Society, by video link from Los Ange=
les to record this lecture to help us celebrate=C2=A0Hamilt=
on Day=C2=A02020.

In light of=C2=
=A0William Rowan Hamilton=E2=80=99s=C2=A0work =
in astronomy, Terry Tao will explain how we can use basic secondary-school =
level maths, along with indirect measurements, to work out the distances be=
tween celestial bodies near and afar.

If you would like to suggest a question to the lecture chair =
for Professor Tao, please email it to=C2=A0**hamilton ria.ie**=C2=A0=
by=C2=A0**12:00 on Friday 2 October**, along with your name and location=
.

__=C2=A0__

__=C2=A0__

Teresa Gallagher, P=
rogrammes & Administration

Royal Irish Academy, Direct line: +35=
3 1 6090676

__=C2=A0____=
__

__=
__=C2=A0

The Academy is subject to the FOI Act 20= 14, the Data Protection Acts 1988-2003 and 2018, GDPR (EU 2016/679) and S.I= . No. 336/2011, EC Privacy & Electronic Communications Regulations. For= further information see our website=C2=A0www.ria.ie/privacy-and-data-prot= ection=C2=A0=C2=A0

title:: Applied
Mathematics Seminar (University College Cork)

content:: Chris Budd** **(University of Bath) will speak on

:: Is
the Mid-Pleistocene Transition a Grazing Bifurcation?

:: For further=
information see:

date-time:: 30th September 2020 at 16:00

location:: MS Teams: contact Philipp Hoevel (philipp.hoevel ucc.ie) fo=
r details

endevent::

DUBLIN THEORETICAL PHYSICS COLLOQUIUM

Wednesday, 30 September 2020, 16:00

Speaker: Stefan Weinzierl=
(University of Mainz)

Title: Feynman integrals associated to e=
lliptic curves

Abstract: Feynman integrals are indispensable for precision calculations i=
n quantum field theory. But they are notoriously difficult to calculate. Wh=
ile we do have methods to compute any one-loop Feynman integral analyticall=
y, already at two-loops there are Feynman integrals for which the known met=
hods fail. The first obstruction one encounters is related to elliptic curv=
es, and for this reason the Feynman integrals not tractable by standard met=
hods are known as =E2=80=9Celliptic" Feynman integrals. In this talk I=
will review our current knowledge about Feynman integrals associated to el=
liptic curves.

All are welcome to join us online, see zoom d=
etails below.

Time: Sep 30, 2020 04:00 PM Dublin

Join Zoom Meeting

https://u=
s02web.zoom.us/j/87032180548?pwd=3DS3pCR2ZQSWg2d3FaS0cxWjMxOThRZz09

Meeting ID: 870 3218 0548

Passcode: hamilton

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

title::=
Dublin Theoretical Physics Colloquium

c=
ontent:: Stefan Weinzierl (University of Mainz)

:: Feynman=
integrals associated to elliptic curves

date-time:: 30 September 2020 at 16:00

location:: Online

endevent::

math: Dear all,

(apologies for =
cross-posting)

The UCD Applied and Computational Maths Seminar =
Series will move online this trimester. As such, we would like to =
open it up to the wider community. Our first seminar takes place =
tomorrow, Wednesday September 30, at 3pm.

Please see below for the seminar =
details and Zoom link/password. We look forward to welcoming you =
tomorrow afternoon.

Best wishes,

=C3=81ine =
Byrne

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

UCD Applied & Computational Mathematics Seminar =

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Join Zoom Meeting
https://ucd-ie.zoom.us/j/93313871404?pwd=3Dc3BDZUdVZHExQlNJcmxPOTFD=
Y2FoUT09
Meeting ID: 933 1387 1404
Passcode: 040190
One tap mobile
+35316533895,,93313871404# Ireland
+35316533897,,93313871404# Ireland
Dial by your location
+353 1 653 3895 Ireland
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Meeting ID: 933 1387 1404
Find your local number: https://ucd-ie.zoom.us/u/acUkn3muie
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Meeting ID: 933 1387 1404
Passcode: 040190

____________________________

**Dr. =C3=81ine Byrne**

Assistant Professor

School of Mathematics and Statistics

University = College Dublin

Assistant Professor

School of Mathematics and Statistics

University = College Dublin

Lovely article about the IMS and our September Meeting by Peter Lynch in hi=
s *That's Maths* column yesterday in the Irish Times. Well worth a rea=
d! Tom.

--_000_DB7PR02MB5273CBA45AE5BAE8F1DAA51A9ACF9DB7PR02MB5273eurp_--
From owner-mathdep LISTSERV.HEANET.IE Mon Sep 6 16:38:10 2021
Return-Path:
Dear all,