2020
Nov
05

# Colloquium: Amit Ophir, HUJI (Tzafriri prize lecture)

2:30pm to 3:30pm

Edmond J. Safra Campus The Hebrew University of Jerusalem

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2020
Nov
05

2:30pm to 3:30pm

2021
Jan
13

12:00pm to 1:00pm

2020
Nov
04

12:00pm to 1:00pm

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.

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
Nov
25

2020
Oct
22

2:30pm to 3:30pm

A power series f is said to satisfy a p-Mahler equation (p>1 a natural number) if it satisfies a functional equation of the form

a_n(x).f(x^{p^n}) + ... + a_1(x).f(x^p) + a_0(x).f(x) = 0

where the coefficients a_i(x) are polynomials. These functional equations were studied by Kurt Mahler with relation to transcendence theory.

a_n(x).f(x^{p^n}) + ... + a_1(x).f(x^p) + a_0(x).f(x) = 0

where the coefficients a_i(x) are polynomials. These functional equations were studied by Kurt Mahler with relation to transcendence theory.

2020
Oct
21

12:00pm to 1:00pm

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

Repeats every week every Wednesday, 3 times .

11:00am to 1:00pm11:00am to 1:00pm

11:00am to 1:00pm

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

Uri Abraham will continue his talks about

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

2:00pm to 4:00pm

https://huji.zoom.us/j/97269425447?pwd=TFhuUkhBYTJsa3BvNzJyZHFBMlZqZz09

2020
Jul
22

Repeats every week every Wednesday until Tue Aug 04 2020 .

11:00am to 1:00pm11:00am to 1:00pm

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

Uri Abraham will continue his talks about

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

2:00pm to 4:00pm

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.

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

2:00pm to 4:00pm

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.

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

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

11:00am to 1:00pm

Zoom - ID: 995 8999 9308 Password: 568039

Jorge Cely will speak about t**he fundamental lemma for spherical Hecke algebras and motivic integration.**

** **

__Abstract:__

2020
Jun
23

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

Join Zoom Meeting

Meeting ID: 917 3652 5930

Password: 7m913h

2020
Jun
30

2:00pm to 3:00pm

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