Events & Seminars

2020 May 11

Combinatorics: Michael Krivelevich (TAU)

11:00am to 12:45pm

Location: 

Zoom

Speaker: Michael Krivelevich, Tel Aviv University
Title: Embedding large minors in weak expanders and in sparse random graphs

                         ABSTRACT

A graph G on n vertices is called an alpha-expander if the external neighborhood of every vertex subset U of size |U|<=n/2 in G has size at least alpha*|U|.
2020 May 06

Logic Seminar - Timo Krisam

11:00am to 1:00pm

Location: 

Zoom: Meeting ID: 959 8849 6874 , Password: 020269
Timo Krisam will speal about distal theories and the type decomposition theorem.
.
Title: Distal Theories and the Type Decomposition Theorem

Abstract: The class of NIP-Theories is an important subject of study in pure model theory. It contains many interesting examples like stable theories, o-minimal theories or algebraically closed valued fields.
2020 May 14

Basic Notions: Mike Hochman "Dimension of Bernoulli convolutions"

4:00pm to 5:15pm

Location: 

Join Zoom Meeting https://huji.zoom.us/j/98768675115?pwd=WnZOZUpuVmpoNGkrYWQxanNVWkQzUT09,
Abstract: The Bernoulli convolution with parameter 1/2 < t < 1 is the distribution of the random variable (+/-)t + (+/-)t^2 + (+/-)t^3 + ..., where the sequence of signs +/- form an  unbiased i.i.d. random sequence. This distribution has been studied since the 1930s, and the main problem is to characterize those parameters t for which the distribution is absolutely continuous, or has full dimension. In these talks I will review the history and recent developments, leading up to P. Varju's proof a little over a year ago, that for all transcendental parameters the dimension is 1.
2020 May 07

Basic Notions: Mike Hochman "Dimension of Bernoulli convolutions"

4:00pm to 5:15pm

Location: 

Join Zoom Meeting https://huji.zoom.us/j/98768675115?pwd=WnZOZUpuVmpoNGkrYWQxanNVWkQzUT09

Abstract: The Bernoulli convolution with parameter 1/2 < t < 1 is the distribution of the random variable (+/-)t + (+/-)t^2 + (+/-)t^3 + ..., where the sequence of signs +/- form an  unbiased i.i.d. random sequence. This distribution has been studied since the 1930s, and the main problem is to characterize those parameters t for which the distribution is absolutely continuous, or has full dimension. In these talks I will review the history and recent developments, leading up to P.
2020 Apr 27

Spencer Leslie [HUJI-BGU AGNT Seminar]

2:15pm to 4:00pm

Location: 

https://zoom.us/j/468718180,
Speaker: Spencer Leslie (Duke)
Title: The endoscopic fundamental lemma for unitary symmetric spaces
Abstract: Motivated by the study of certain cycles in locally symmetric
spaces and periods of automorphic forms on unitary groups, I propose a
theory of endoscopy for certain symmetric spaces. The main result is the
fundamental lemma for the unit function. After explaining where the
fundamental lemma fits into this broader picture, I will describe its
proof.
Join Zoom Meeting
2020 May 05

Dynamics Seminar: Matan Seidel (TAU): "Random Walks on Circle Packings"

2:00pm to 3:00pm

Abstract: A circle packing is a canonical way of representing a planar graph. There is a deep connection between the geometry of the circle packing and the proababilistic property of recurrence/transience of the simple random walk on the underlying graph, as shown in the famous He-Schramm Theorem. The removal of one of the Theorem's assumptions - that of bounded degrees - can cause the theorem to fail. However, by using certain natural weights that arise from the circle packing for a weighted random walk, (at least) one of the directions of the He-Schramm Theorem remains true.
2020 May 05

Dynamics Lunch: Or Landesberg: "Ends of hyperbolic three manifolds and dynamics of horospherical foliations"

12:00pm to 1:00pm

Abstract: A circle packing is a canonical way of representing a planar graph. There is a deep connection between the geometry of the circle packing and the proababilistic property of recurrence/transience of the simple random walk on the underlying graph, as shown in the famous He-Schramm Theorem. The removal of one of the Theorem's assumptions - that of bounded degrees - can cause the theorem to fail. However, by using certain natural weights that arise from the circle packing for a weighted random walk, (at least) one of the directions of the He-Schramm Theorem remains true.

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