2021
Jan
07

# Colloquium

2020
Nov
19

2020
Dec
10

# Colloquium: Aaron Naber (Northwestern)

2:30pm to 3:30pm

2020
Dec
03

# Colloquium: Janos Pach (NYU)

2:30pm to 3:30pm

2020
Nov
05

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

2:30pm to 3:30pm

2020
Oct
22

# Colloquium: Ehud de Shalit (HUJI) — Difference equations and elliptic functions

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
Jun
18

# Colloquium: Nati Linial (HUJI) - Hypertrees

2:30pm to 3:30pm

## Location:

https://huji.zoom.us/j/93456379511?pwd=OHFOZEFJZDIrckx5V01PMnZGRk1wQT09

Meeting ID: 934 5637 9511

Password: 5l113u

Password: 5l113u

**Hypertrees**__Title:__
2020
Jun
18

2020
May
14

2020
Jan
23

# Colloquium: Gil Kalai (HUJI) - Some recent advances in combinatorics

2:30pm to 3:30pm

## Location:

Manchester Building (Hall 2), Hebrew University Jerusalem

I will discuss some recent advances in combinatorics, among them the disproof of Hedetniemi conjecture by Shitov, the proof of the sensitivity conjecture by Huang, the progress on the Erdos-Rado sunflower conjecture by Alweiss, Lovett, Wu, and Zhang, and the progress on the expectation threshold conjecture by Frankston, Kahn, Narayanan, and Park.

2019
Dec
05

# Colloquium: Yoel Groman (HUJI) - Floer homology of the magnetic cotangent bundle

2:30pm to 3:30pm

## Location:

Manchester Building (Hall 2), Hebrew University Jerusalem

Hamiltonian Floer cohomology was invented by A. Floer to prove the Arnold conjecture: a Hamiltonian diffemorphism of a closed symplectic manifold has at least as many periodic orbits as the sum of the Betti numbers. A variant called Symplectic cohomology was later defined for certain non compact manifolds, including the cotangent bundle of an arbitrary closed smooth manifold. The latter is the setting for classical mechanics of constrained systems. Read more about Colloquium: Yoel Groman (HUJI) - Floer homology of the magnetic cotangent bundle

2020
Apr
30

2020
Mar
26

2020
Apr
02

2020
Mar
19

# Colloquium: CANCELLED

2:30pm to 3:30pm

## Location:

Manchester Building (Hall 2), Hebrew University Jerusalem

Abstract: A spanning tree of a graph G is a subgraph with the same vertex set which is a tree. In 1981, McKay proved an asymptotic result regarding the number of spanning trees in random k-regular graphs. In this talk we will discuss an analogous result for certain random simplicial complexes (All terms will be explained in the talk).

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The talk is based on a joint work with Lior Tenenbaum.