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 May 24

# Colloquium: Janos Pach (EPFL Lausanne and Renyi Institute Budapest)

2:30pm to 3:30pm

## Location:

Manchester Building (Hall 2), Hebrew University Jerusalem
2018 Apr 09

# NT&AG: Kirsten Wickelgren (Georgia Tech)

2:00pm to 3:00pm

## Location:

Room 70A, Ross Building, Jerusalem, Israel
2018 Mar 28

# Analysis Seminar: TBA

12:00pm to 1:00pm

2018 Jun 06

# Analysis Seminar: Michal Pnueli

12:00pm to 1:00pm

2018 May 02

# Analysis Seminar: Bo'az Klartag

12:00pm to 1:00pm

2018 Feb 05

# HD-Combinatorics special day: Stability and property testing (organized by Oren Becker)

(All day)

## Location:

Room 130, IIAS, Feldman Building, Givat Ram
2018 Feb 26

# HD-Combinatorics Special Day on On Random groups and property T (organized by Izhar Oppenheim)

10:00am to 5:00pm

## Location:

IIAS, Feldman Building, Givat Ram
2018 Jan 31

# Analysis Seminar: Balazs Rath "Self-organized criticality in dynamic random graph models"

12:00pm to 1:00pm

2016 Jun 09

# Joint Amitsur Algebra&NT Seminar: Shai Haran (Technion), "New foundations for geometry"

12:00pm to 1:15pm

## Location:

Manchester Building (Ross 63), Jerusalem, Israel
*** Please note the LOCATION *** We shall give a simple generalization of commutative rings. The category GR of such generalized rings contains ordinary commutative rings (fully, faithfully), but also the "integers" and the "residue field" at a real or complex place of a number field ; the "field with one element" F1 (the initial object of GR) ; the "Arithmetical Surface" (the categorical sum of the integers Z with them self). We shall show this geometry sees the real and complex places of a number field K : the valuation sub GR of K correspond to the finite and
2018 Jun 14

# Colloquium: Zuchovitzky lecture

2:30pm to 3:30pm

## Location:

Manchester Building (Hall 2), Hebrew University Jerusalem
2016 Apr 21

# Amitsur Algebra: Konstantin Golubev (HU)

12:00pm to 1:15pm

## Location:

Manchester Building (room 209), Jerusalem, Israel
Title: Spectral approach to the chromatic number of a simplicial complex Abstract: In this talk, we'll summarize results obtained in recent years in a pursuit for spectral bounds for the chromatic number of a simplicial complex. As the principal application, we'll show that Ramanujan complexes serve as family of explicitly constructed complexes with large girth and large chromatic number. We'll also present other results, such as a bound on the expansion and a bound on the mixing of a complex, and refer to open questions. Based on joint work with S.Evra, A.Lubotzky and O.Parzanchevski.
2018 Jun 28

# Colloquium: Barry Simon (Caltech)

2:30pm to 3:30pm

## Location:

Manchester Building (Hall 2), Hebrew University Jerusalem
2016 Jan 07

# Amitsur Algebra: Gili Schul (Hebrew U): Rapid expansion in finite simple groups

12:00pm to 1:15pm

## Location:

Manchester Building (room 209), Jerusalem, Israel
Title: Rapid expansion in finite simple groups Abstract: We show that small normal subsets $A$ of finite simple groups expand very rapidly -- namely, $|A^2| \ge |A|^{2-\epsilon}$, where $\epsilon >0$ is arbitrarily small. Joint work with M. W. Liebeck and A. Shalev
2018 Jan 25

# Special seminar: Sylvian Cappell (NYU) "What can be the fixed point sets of a given finite group acting on a non-simply-connected compact space?"

10:30am to 11:30am

## Location:

Ross 70
We will report on a joint work with Shmuel Weinberger of U. of Chicago & Min Yan of Hong Kong U. of Sci. & Tech.