Hebrew University of Jerusalem

Fri 19 Sep 2014, 3:00pm
Department Colloquium
ESB 2012 (PIMS)

High dimensional expanders and Ramanujan complexes (PIMSUBC Distinguished Colloquium)

ESB 2012 (PIMS)
Fri 19 Sep 2014, 3:00pm4:00pm
Abstract
Expander graphs have played, in the last few decades, an important role in computer science, and in the last decade, also in pure mathematics. In recent years a theory of "highdimensional expanders" is starting to emerge  i.e., simplical complexes which generalize various properties of expander graphs. This has some geometric motivations (led by Gromov) and combinatorial ones (started by Linial and Meshulam). The talk will survey the various directions of research and their applications, as well as potential applications in math and CS. Some of these lead to questions about buildings and representation theory of padic groups.
We will survey the work of a number of people. The works of the speaker in this direction are with various subsets of { S. Evra, K. Golubev, T. Kaufman, D. Kazhdan , R. Meshulam, S. Mozes }
hide

UBC

Fri 26 Sep 2014, 3:00pm
Department Colloquium
Mathematics Annex 1100

The Dynamical MordellLang problem

Mathematics Annex 1100
Fri 26 Sep 2014, 3:00pm4:00pm
Abstract
A space X is called Noetherian if there is no infinite descending chain of closed subsets of X. Let X be a Noetherian space, let f be a continuous selfmap on X, let Y be a closed subset of X, and let x be a point in X. We show that the set containing all positive integers n such that the nth iterate of x under f lands in Y is a union of at most finitely many arithmetic progressions along with a set of Banach density 0. This result has various consequences from the distribution of zeros in recurrence sequences to questions in arithmetic geometry.
hide

UBC

Fri 3 Oct 2014, 3:00pm
Department Colloquium
MATH Annex 1100

TBA

MATH Annex 1100
Fri 3 Oct 2014, 3:00pm4:00pm
Abstract
hide

Harvard University

Fri 10 Oct 2014, 3:00pm
Department Colloquium
ESB 2012 (PIMS) Time and date to be confirmed

PIMSUBC Distinguished Colloquium, TitleTBA

ESB 2012 (PIMS) Time and date to be confirmed
Fri 10 Oct 2014, 3:00pm4:00pm
Abstract
hide

Univeristy of Michigan

Fri 31 Oct 2014, 3:00pm
Department Colloquium
ESB 2012 (PIMS)

PIMSIAMUBC distinguished colloquium

ESB 2012 (PIMS)
Fri 31 Oct 2014, 3:00pm4:00pm
Abstract
hide


Fri 14 Nov 2014, 3:00pm
Department Colloquium
TBA

TBA

TBA
Fri 14 Nov 2014, 3:00pm4:00pm
Abstract
hide

Caltech

Fri 30 Jan 2015, 3:00pm
Department Colloquium
ESB 2012 (PIMS) TBA (time and date to be confirmed)

PIMSUBC distinguished colloquium

ESB 2012 (PIMS) TBA (time and date to be confirmed)
Fri 30 Jan 2015, 3:00pm4:00pm
Abstract
hide

Brown University

Fri 13 Mar 2015, 3:00pm
Department Colloquium
ESB 2012 (PIMS)

PIMSUBC Distinguished Colloquium, TitleTBA

ESB 2012 (PIMS)
Fri 13 Mar 2015, 3:00pm4:00pm
Abstract
hide
