2019
Dec
10

# Hongming Nie

12:00pm to 1:00pm

Edmond J. Safra Campus The Hebrew University of Jerusalem

2019
Dec
10

12:00pm to 1:00pm

2020
Jan
21

2019
Dec
02

2:30pm to 3:30pm

Ross 70

Title:Cubic Fourfolds: Rationality and Derived Categories

Read more about NT Seminar - Howard Nuer

2019
Dec
09

2:30pm to 3:30pm

Ross 70

Title: The generalized doublingmethod and its applications

Abstract: The doubling method,first introduced by Piatetski-Shapiro and Rallis in the 80s, has had numerousapplications, e.g. to the theta correspondence and to arithmetic problems.In a series of recent works this method was generalized in severalaspects, with an application to functoriality from classical groups to GL(N).The most recent result is a multiplicityone theorem (joint work with Gourevitch and Aizenbud).

I will brieflysurvey the method and talk about some of its applications.

2019
Nov
27

2019
Dec
16

2019
Dec
26

10:00am to 11:00am

2019
Dec
24

2:30pm to 3:30pm

Abstract:

A restricted permutation of a locally finite directed graph $G=(V,E)$ is a vertex permutation $\pi: V\to V$ for which $(v,\pi(v))\in E$, for any vertex $v\in V$. The set of such permutations, denoted by $\Omega(G)$, with a group action induced from a subset of graph isomorphisms form a topological dynamical system. In the particular case presented by Schmidt and Strasser (2016), where $V=\mathbb{Z}^d$ and $(n,m)\in E$ iff $(n-m)\in A$ ($A\subseteq \mathbb{Z^d}$ is fixed), $\Omega(G)$ is a subshift of finite type.

A restricted permutation of a locally finite directed graph $G=(V,E)$ is a vertex permutation $\pi: V\to V$ for which $(v,\pi(v))\in E$, for any vertex $v\in V$. The set of such permutations, denoted by $\Omega(G)$, with a group action induced from a subset of graph isomorphisms form a topological dynamical system. In the particular case presented by Schmidt and Strasser (2016), where $V=\mathbb{Z}^d$ and $(n,m)\in E$ iff $(n-m)\in A$ ($A\subseteq \mathbb{Z^d}$ is fixed), $\Omega(G)$ is a subshift of finite type.

2020
Jan
15

12:00pm to 1:00pm

Ross 70

We consider a system of N points evolving according to the gradient flow of their Coulomb or Riesz interaction, or a similar conservative flow. By Riesz interaction, we mean inverse power s of the distance with s between d-2 and d where d denotes the dimension. We show a convergence result as N tends to infinity to the expected limiting evolution equation. This was previously an open question in general dimension, rendered difficult by the singular nature of the interaction. We will also discuss briefly similar results in the context of models of superfluidity and superconductivity.

2020
Jan
07

2:00pm to 3:00pm

hyperbolic systems preserving an infinite measure making a particular

emphasis on mixing for extended systems. This talk is based on a joint

work with Peter Nandori.

2019
Dec
17

2:00pm to 3:00pm

Ross 70

Abstract: A subset of the integers P is called predictive if for all zero-entropy processes X_i; i in Z, X_0 can be determined by X_i; i in P. The classical formula for entropy shows that the set of natural numbers forms a predictive set. In joint work with Benjamin Weiss, we will explore some necessary and some sufficient conditions for a set to be predictive. These sets are related to Riesz sets (as defined by Y. Meyer) which arise in the study of singular measures. This and several questions will be discussed during the talk.

2020
Jan
15

Sylvia Serfaty

12:00pm to 2:00pm

Ross 70

We consider a system of N points evolving according to the gradient flow of their Coulomb or Riesz interaction, or a similar conservative flow. By Riesz interaction, we mean inverse power s of the distance with s between d-2 and d where d denotes the dimension. We show a convergence result as N tends to infinity to the expected limiting evolution equation. This was previously an open question in general dimension, rendered difficult by the singular nature of the interaction. We will also discuss briefly similar results in the context of models of superfluidity and superconductivity.

2019
Nov
21

2019
Nov
20

11:00am to 1:00pm

Ross building - Room 63

I will present work in progress in a new NSOP1 nonsimple theory: the expansion of an abelian variety by a generic subgroup, under some conditions on the endomorphism ring.

2019
Nov
24

2:00pm to 3:00pm

Elath Hall, 2nd floor, Feldman Building

In the past several years we have developed a comprehensive theory of large scale learning with Deep Neural Networks (DNN), when optimized with Stochastic Gradient Decent (SGD). Read more about Game Theory Seminar: Naftali Tishby "Information Theory of Deep Learning"

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