# Eventss

2016
Jan
07

# Zabrodsky Lectures: Peter Ozsváth (Princeton)

Thu, 07/01/2016 (All day) to Mon, 11/01/2016 (All day)

# Zabrodsky Lectures: Peter Ozsváth (Princeton)

2016
Nov
20

# Zabrodsky Lectures: Dan Freed (University of Texas)

Sun, 20/11/2016 (All day) to Thu, 24/11/2016 (All day)

# Zabrodsky Lectures : Prof. Dan Freed (University of Texas)

2018
Apr
26

2018
Apr
26

# Zabrodsky Lectures: Camillo De Lellis (Universität Zürich)

Thu, 26/04/2018 (All day) to Tue, 01/05/2018 (All day)

2018
May
23

# Colloquium: Janos Pach (EPFL Lausanne, IIAS and Renyi Institute Budapest) - "The Crossing Lemma"

4:15pm to 5:15pm

## Location:

Manchester Building (Hall 2), Hebrew University Jerusalem

The Crossing Lemma of Ajtai, Chvátal, Newborn, Szemerédi (1982) and Leighton (1983 )states that if a graph of n vertices and e>4n edges is drawn in the plane, then the number of crossings between its edges must be at least constant times e^3/n^2. This statement, which is asymptotically tight, has found many applications in combinatorial geometry and in additive combinatorics. However, most results that were obtained using the Crossing Lemma do not appear to be optimal, and there is a quest for improved versions of the lemma for graphs satisfying certain special properties.

2018
Apr
09

2018
May
02

# Analysis Seminar: Bo'az Klartag "Convex geometry and waist inequalities"

12:00pm to 1:00pm

## Location:

room 70, Ross Building

Abstract: We will discuss connections between Gromov's work on isoperimetry of waists and Milman's work on the M-ellipsoid of a convex body. It is proven that any convex body K in an n-dimensional Euclidean space has a linear image K_1 of volume one satisfying the following waist inequality: Any continuous map f from K_1 to R^d has a fiber f^{-1}(t) whose (n-d)-dimensional volume is at least c^{n-d}, where c > 0 is a universal constant. Already in the case where f is linear, this constitutes a slight improvement over known results.

2018
Mar
28

# Analysis Seminar: TBA

12:00pm to 1:00pm

2018
Jun
06

# Analysis Seminar: Michal Pnueli "Dynamics in a Hamiltonian Impact System"

12:00pm to 1:00pm

## Location:

Ross Building, Room 70

Abstract:

Hamiltonian impact systems are dynamical systems in which there are two main mechanisms which dictate the system’s behavior - Hamilton’s equations which govern the motion inside the impact system domain, and the billiard reflection rule which governs the motion upon reaching the domain boundary. As the dynamics in impact systems are piecewise smooth by nature due to the

collisions with the boundary, many of the traditional tools used in the analysis of Hamiltonian

2018
Feb
05

2018
Feb
26

# HD-Combinatorics Special Day on On Random groups and property T (organized by Izhar Oppenheim)

(All day)

## Location:

Room 130, IIAS, Feldman Building, Givat Ram

10:00-11:00:

**Izhar Oppenheim**, Introduction to Property (T)

11:30-12:30:

**Izhar Oppenheim,**Introduction to Random Groups

14:00-16:00:

**Izhar Oppenheim,**Property (T) and hyperbolicity for random groups in the permutation model

2018
Jan
31