2019
Mar
20

# Analysis Seminar: Andrei Osipov (Yale)

12:00pm to 1:00pm

2019
Mar
20

12:00pm to 1:00pm

2019
May
29

12:00pm to 1:00pm

2019
Jan
09

2018
Dec
26

Avi Wigderson (IAS)

10:30am to 12:00pm

Rothberg (CS building) B-220

This talk provides a gentle, high level introduction to (the beautiful) Invariant Theory, that is aimed at non-experts. It will describe some of its main objects, problems and results. Read more about CS theory seminar: Avi Wigderson (IAS) : An invitation to Invariant Theory

2018
Dec
25

2:15pm to 3:15pm

Ross 70

The geodesic flow on a normal cover of a compact hyperbolic surface admits a "random walk" on the group of decks transformations $G$. In this talk, I'll provide some recent results which connect this walk to the geometric properties of the cover and $G$.

2018
Dec
25

1:00pm to 2:00pm

Room 70, Ross Building, Jerusalem, Israel

In the last 35 years, geometric flows have proven to be a powerful tool in geometry and topology. The Mean Curvature Flow is, in many ways, the most natural flow for surfaces in Euclidean space. In this talk, which will assume no prior knowledge, I will illustrate how mean curvature flow could be used to address geometric questions.

2019
Jan
11

11:45am to 12:45pm

Manchester Building (Hall 2), Hebrew University Jerusalem

Let u be a harmonic function on the plane. The Liouville theorem claims that if |u| is bounded on the whole plane, then u is identically constant. It appears that if u is a harmonic function on the lattice Z^2, and |u| < 1 on 99,99% of Z^2, then u is a constant function. Based on a joint work with A. Logunov, Eu. Malinnikova and M. Sodin.

2019
Jan
11

10:15am to 11:15am

Manchester Building (Hall 2), Hebrew University Jerusalem

Second talk out of two on the proof - the first talk can be found here. Read more about Joram Seminar: Larry Guth (MIT) - On the proof of decoupling II

2019
Jan
11

9:00am to 10:00am

Manchester Building (Hall 2), Hebrew University Jerusalem

First talk out of two on the proof - the second talk can be found here. Read more about Joram Seminar: Larry Guth (MIT) - On the proof of decoupling I

2018
Dec
31

11:00am to 1:00pm

CS bldg, room B500, Safra campus Givat Ram

Speaker: Zur Luria, JCE
Title: On the threshold for simple connectivity in random 2-complexes
Abstract:

2018
Dec
24

11:00am to 1:00pm

Rothberg CS room B500, Safra campus, Givat Ram

Speaker: Benny Sudakov, ETH, Zurich
Title: Subgraph statistics
Abstract:
Consider integers $k,\ell$ such that $0\le \ell \le \binom{k}2$. Given
a large graph $G$, what is the fraction of $k$-vertex
subsets of $G$ which span exactly $\ell$ edges? When $G$ is empty or
complete, and $\ell$ is zero or $\binom k 2$,
this fraction can be exactly 1. On the other hand if $\ell$ is not one
these extreme values, then by Ramsey's theorem, this
fraction is strictly smaller than 1.
The systematic study of the above question was recently initiated by

2018
Dec
17

11:00am to 1:00pm

Rothberg CS bldg, room B500, Safra campus, Givat Ram

Speaker: Wojciech Samotij, TAU
Title: Subsets of posets minimising the number of chains
Abstract:

2019
Jan
10

4:00pm to 5:15pm

Manchester Building (Hall 2), Hebrew University Jerusalem

The proof of decoupling grew out of an area of Fourier analysis called restriction theory. In this talk, we will describe some of the basic problems and tools of restriction theory, especially wave packets, which are a crucial idea in the proof of decoupling.

2018
Dec
17

2:30pm to 3:30pm

Ross 70

Title: Local root numbers for Heisenberg representations

Abstract: On the Langlands program, explicit computation of the local root numbers

(or epsilon factors) for Galois representations is an integral part.

But for arbitrary Galois representation of higher dimension, we do not

have explicit formula for local root numbers. In our recent work

(joint with Ernst-Wilhelm Zink) we consider Heisenberg representation

(i.e., it represents commutators by scalar matrices) of the Weil

2018
Dec
20

4:00pm to 5:00pm

Ross 70

The general theme is game dynamics leading to equilibrium concepts.
The plan is to deal with the following topics (all concepts will be defined, and proofs / proof outlines will be provided):
(1) An integral approach to the construction of calibrated forecasts and their use for Nash equilibrium dynamics.
(2) Blackwell's Approachability Theorem and its use for correlated equilibrium dynamics (regret-matching).
(3) Communication complexity and its use for the speed of convergence of uncoupled dynamics.