• 2020 Jul 06

Combinatorics: Xinyu Wu (CMU)

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 30

Tsviqa Lakrec (HUJI). Affine Random Walks on the Torus

2:00pm to 3:00pm

Abstract: I will discuss a quantitative equidistribution result for the random walk on a torus arising from the action of the group of affine transformations. This is a joint work with Weikun He and Elon Lindenstrauss.

• 2020 Jun 29

Combinatorics:

Repeats every week every Monday until Mon Jun 29 2020 except Mon Apr 06 2020.
11:00am to 1:00pm

Location:

Manchester 110

Speaker: TBA

Title: TBA

Abstract: TBA
• 2020 Jun 29

Combinatorics: Dan Hefez (Ariel)

11:00am to 1:00pm

In this talk we will study the so-called perturbed model which is a graph distribution of the form G \cup \mathbb{G}(n,p), where G is an n-vertex graph with edge-density at least d > 0, and d is independent of n.

We are interested in the threshold of the following anti-Ramsey property: every proper edge-colouring of G \cup \mathbb{G}(n,p) yields a rainbow copy of K_s. We have determined this threshold for every s.

Based on joint work with Elad Aigner-Horev, Oran Danon and Shoham Letzter.

• 2020 Jun 24

Analysis Seminar: Angkana Rüland (Heidelberg) "Microstructure in Shape-Memory Alloys: Rigidity, Flexibility and Some Numerical Simulations"

12:00pm to 1:00pm

Location:

zoom

Title: Microstructure in Shape-Memory Alloys: Rigidity,Flexibility and Some Numerical Simulations

Abstract: In this talk I will discuss a striking dichotomy whichoccurs in the mathematical analysis of microstructures in shape-memory alloys:On the one hand, some models for these materials display a very rigid structurewith only very specific microstructures, if one assumes that surface energiesare penalised. On the other hand, without this penalisation, for the samemodels a plethora of very wild'' solutions exists.

• 2020 Jun 24

Logic Seminar - Jorge Cely

11:00am to 1:00pm

Location:

Zoom - ID: 995 8999 9308 Password: 568039
Jorge Cely will speak about the fundamental lemma for spherical Hecke algebras and motivic integration.

Abstract:
• 2020 Jun 24

Amitsur Memorial Symposium 2020 (on Zoom)

(All day)

Location:

Zoom

The Amitsur Memorial Symposium is an annual conference in memory of Prof. Shimshon Avraham Amitsur. It is hosted by a different institution each year since 1995.

The 27th Amitsur Memorial Symposium was originally planned to take place on the grounds of the Open University of Israel in Raanana. Instead, due to the COVID-19 pandemic, it will be held online on June 24th and 25th, 17:00–20:30

• 2020 Jun 23

Dalia Terhesiu (Leiden) Mixing rates for Infinite horizon Lorentz maps

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
• 2020 Jun 22

[HUJI-BGU AGNT Seminar]

Repeats every week every Monday until Sun Jun 28 2020 except Mon Apr 06 2020.
2:15pm to 4:00pm

Location:

https://zoom.us/j/468718180
Join Zoom Meeting
https://zoom.us/j/468718180
Meeting ID: 468 718 180
• 2020 Jun 22

Combinatorics: Lukas Kuhne (HUJI)

11:00am to 1:00pm

Speaker: Lukas Kuhne (HUJI)

Title:  Matroids doing Algebra

Abstract:

A matroid  is a combinatorial object based on an abstraction of linear independence in vector spaces and forests in graphs. It is a classical question to determine whether a given matroid is representable as a vector configuration over a field. Such a matroid is called linear.