• 2018 Apr 26

# Basic Notions: Alex Lubotzky "From expander graphs to high dimensional expanders: a road map"

4:00pm to 5:30pm

## Location:

Math Hall 2
Expander graphs have been a topic of great interest in the last 50 years for mathematicians and computer scientists. In recent years a high dimensional theory is emerging.  We will describe some of its main directions and questions.
• 2018 Apr 26

# Colloquium: Zabrodsky lectures - Camillo De Lellis (University of Zurich) - "The oriented Plateau problem and a question of Almgren"

2:30pm to 3:30pm

## Location:

Manchester Building (Hall 2), Hebrew University Jerusalem
• 2018 Apr 25

# Special Talk : Justin Noel (University of Regensburg) - "Blue-shift and thick tensor ideals"

## Lecturer:

Justin Noel (University of Regensburg)
2:30pm to 3:30pm

## Location:

Shprinzak 27

Abstract:

I will discuss a recent generalization of Kuhn's Blue-shift theorem about Tate cohomology. Combining this result with work of Arone, Dwyer, and Lesh we resolve a conjecture of Balmer and Sanders and classify the thick tensor ideals of compact genuine $A$-spectra, where $A$ is a finite abelian group. This is joint work with Tobias Barthel, Markus Hausmann, Niko Naumann, Thomas Nikolaus, and Nathaniel Stapleton.

• 2018 Apr 25

# Analysis Seminar: Latif Eliaz "The Essential Spectrum of Schroedinger Operators on Graphs"

12:00pm to 1:00pm

## Location:

Room 70, Ross Building

It is known that the essential spectrum of aSchrödinger operator H on\ell^2(\mathbb{N})  is equal to the union of the spectra of right limits ofH. The naturalgeneralization of this relation to \mathbb{Z}^n  is known to hold as well.In this talk we study thepossibility of generalizing this characterization of \sigma_{ess}(H)  tographs. We show that the general statement fails, while presenting natural families of models where it still holds.

• 2018 Apr 24

# No seminar

2:00pm to 3:00pm

• 2018 Apr 24

# T&G: Anton Khoroshkin (HSE), Compactified moduli spaces of rational curves with marked points as homotopy quotients of operads

1:00pm to 2:30pm

## Location:

Room 63, Ross Building, Jerusalem, Israel
I will explain the notion of a homotopy quotient of an operad providing different examples of operads of compactified moduli spaces of genus zero curves with marked points: including the space of complex curves (math.arXiv:1206.3749), the real loci of the complex one (arXiv:math/0507514) and the noncommutative …
• 2018 Apr 24

# No seminar - High Dim Combinatorics conference

12:00pm to 1:00pm

## Location:

Manchester lounge
• 2018 Apr 22

# Geometric, Topological and Computational Aspects of High-Dimensional Combinatorics

Sun, 22/04/2018 (All day) to Thu, 26/04/2018 (All day)

## Location:

Israel Institute for Advanced Studies, The Hebrew University of Jerusalem
• 2018 Apr 17

# Dynamics seminar: Elon Lindenstrauss (HUJI) - Symmetry of entropy in higher rank diagonalizable actions and measure classification

2:15pm to 3:15pm

Ross 70
• 2018 Apr 17

# Dynamics Lunch: Or Shalom (Huji) "Partition regularity of some quadratic equations."

12:00pm to 1:00pm

## Location:

Manchester lounge