2020 Jun 08

# Combinatorics: Bannai Eiichi (Kyushu University)

11:00am to 12:45pm

## Location:

Zoom

Speaker: Bannai Eiichi (Kyushu University)

Title:
On unitary t-designs

Abstract:

The purpose of design theory is for a given space $M$ to find good finite subsets $X$ of $M$ that approximate the whole space $M$ well. There are many design theories for various spaces $M$. If $M$ is the sphere $S^{n-1}$ then such $X$ are called spherical designs. If $M$ is the unitary group $U(d)$, then such $X$ are called unitary designs.
2020 May 18

# Combinatorics: Tahl Nowik (BIU)

11:00am to 12:45pm

2020 Jun 15

# Combinatorics: Lior Gishboliner (TAU)

11:00am to 12:45pm

Zoom
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 06

# Set Theory E-Seminar: Alejandro Poveda (Universitat de Barcelona) - Sigma-Prikry forcings and their iterations

11:00am to 1:00pm

## Location:

Zoom meeting ID 243-676-331
Joint E-seminar of Bar-Ilan University and the Hebrew University

Title: Sigma-Prikry forcings and their iterations
2020 May 04

# Basic Set Theory E-seminar: Tzoor Plotnikov - Side conditions forcing of two types and the Proper Forcing Axiom.

11:00am to 1:00pm

## Location:

Zoom meeting 995 0029 0990 . Password - 789132
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 20

# Charlotte Chan [HUJI-BGU AGNT Seminar]

4:30pm to 5:30pm

## Location:

https://zoom.us/j/468718180,
Join Zoom Meeting
https://zoom.us/j/468718180
Meeting ID: 468 718 180
Charlotte Chan (MIT)
Title: L-packets of S-unramified regular supercuspidal representations
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 19

# Dynamics seminar : Michael Bersudsky (Technion) "Equidistribution of the image in the torus of sparse points on dilating analytic curves"

2:00pm to 3:00pm

Title: Equidistribution of the image in the torus of sparse points on dilating analytic curves