Eventss

2020 Nov 04

Analysis Seminar: Xavier Lamy (Toulouse) — On relaxed harmonic maps with anisotropy

12:00pm to 1:00pm

Location: 

Zoom
Consider maps $u:R^n\to R^k$ with values constrained in a fixed
submanifold, and minimizing (locally) the energy $E(u)=\int W(
abla
u)$. Here $W$ is a positive definite quadratic form on matrices.
Compared to the isotropic case $W(
abla u)=|
abla u|^2$ this may look
like a harmless generalization, but the regularity theory for general
$W$'s is widely open. I will explain why, and describe results with
Andres Contreras on a relaxed problem, where the manifold-valued
constraint is replaced by an integral penalization.
2020 Oct 21

Analysis Seminar: Klas Modin (Chalmers University and the University of Gothenburg) — The structure of groups of diffeomorphisms

12:00pm to 1:00pm

Location: 

Ross 70/Zoom
In 1966 V. Arnold made an astonishing discovery: the incompressible Euler equations describe Riemannian geodesics on the infinite-dimensional “Lie group" of volume-preserving diffeomorphisms. This discovery led to geometric hydrodynamics – a field that today encompasses many equations of mathematical physics, information theory, shape analysis, etc. In this talk I shall address the infinite-dimensional manifold and group structures assigned to spaces of diffeomorphisms. Having such structures in place often enable out-of-the-box local existence and uniqueness results.
2020 Aug 05

HUJI Set Theory seminar - Uri Abraham

Repeats every week every Wednesday, 3 times .
11:00am to 1:00pm

11:00am to 1:00pm
11:00am to 1:00pm

Location: 

https://huji.zoom.us/s/99500290990

Uri Abraham will continue his talks  about  

Coding well ordering of the reals with ladders.
Zoom Meeting Id:  995 0029 0990
Meeting Password:  789132


The following is a link to the recording of Uri's first talk- 

https://huji.cloud.panopto.eu/Panopto/Pages/Viewer.aspx?id=046d98ce-f66a-4bc0-ac5a-abf900ad714e
2020 Jul 27

Combinatorics: Doron Puder (TAU)

2:00pm to 4:00pm

Location: 

https://huji.zoom.us/j/97269425447?pwd=TFhuUkhBYTJsa3BvNzJyZHFBMlZqZz09
Speaker: Doron Puder (TAU)

Title: Random permutations sampled by surface groups
2020 Jul 22

HUJI Set Theory seminar - Uri Abraham

Repeats every week every Wednesday until Tue Aug 04 2020 .
11:00am to 1:00pm

11:00am to 1:00pm

Location: 

https://huji.zoom.us/s/99500290990

Uri Abraham will continue his talks  about  

Coding well ordering of the reals with ladders.
Zoom Meeting Id:  995 0029 0990
Meeting Password:  789132


The following is a link to the recording of Uri's first talk- 

https://huji.cloud.panopto.eu/Panopto/Pages/Viewer.aspx?id=046d98ce-f66a-4bc0-ac5a-abf900ad714e
2020 Jul 13

Combinatorics: Edinah K. Gnang (JHU)

2:00pm to 4:00pm

Location: 

Zoom
Speaker: Edinah K. Gnang (JHU)
Title: On the Kotzig-Ringel-Rosa conjecture
Abstract:
In this talk we describe and motivate the K.R.R. conjecture and describe a functional graph theoretic approach enabling us to tackle the K.R.R. conjecture via a composition lemma.
2020 Jul 20

Combinatorics: Daniel Kalmanovich (HUJI)

2:00pm to 4:00pm

Location: 

Zoom
Speaker: Daniel Kalmanovich (HUJI)
Title: Cubical polytopes
Abstract:
Convex polytopes have fascinated people for ages, and questions about their combinatorics and their geometry have been widely studied.
2020 Jul 06

Combinatorics: Xinyu Wu (CMU)

2:00pm to 4:00pm


Speaker: Xinyu Wu (CMU)
Title: Explicit near-fully X-Ramanujan graphs
Abstract:
In this talk I will introduce constructions of finite graphs which resemble some given infinite graph both in terms of their local neighborhoods, and also their spectrum.
2020 Jun 24

Logic Seminar - Jorge Cely

11:00am to 1:00pm

Location: 

Zoom - ID: 995 8999 9308 Password: 568039
Jorge Cely will speak about the fundamental lemma for spherical Hecke algebras and motivic integration.
 

Abstract:
2020 Jun 23

Dalia Terhesiu (Leiden) Mixing rates for Infinite horizon Lorentz maps

2:00pm to 3:00pm

Abstract: I will report on recent results on sharp error rates in the local limit theorem for the Sinai billiard map (one and two dimensional) with infinite horizon. This is joint work with F. Pene. This result allows to also obtain higher order terms and thus, sharp mixing rates in the speed of mixing of dynamically Hölder observables for the planar and tubular infinite horizon Lorentz gases in the map (discrete time) case.

Join Zoom Meeting
Meeting ID: 917 3652 5930
Password: 7m913h

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