Past Events

  • 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 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
    Password: 7m913h
  • 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.

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