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 Events
Hebrew University of Jerusalem
Fri 19 Sep 2014, 3:00pm
Department Colloquium
ESB 2012 (PIMS)
High dimensional expanders and Ramanujan complexes (PIMS-UBC Distinguished Colloquium)
ESB 2012 (PIMS)
Fri 19 Sep 2014, 3:00pm-4:00pm

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 "high-dimensional 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 p-adic 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 }
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UBC
Fri 26 Sep 2014, 3:00pm
Department Colloquium
Mathematics Annex 1100
The Dynamical Mordell-Lang problem
Mathematics Annex 1100
Fri 26 Sep 2014, 3:00pm-4:00pm

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 self-map 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 n-th 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.
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UBC
Fri 3 Oct 2014, 3:00pm
Department Colloquium
MATH Annex 1100
TBA
MATH Annex 1100
Fri 3 Oct 2014, 3:00pm-4:00pm

Abstract


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Harvard University
Fri 10 Oct 2014, 3:00pm
Department Colloquium
ESB 2012 (PIMS) Time and date to be confirmed
PIMS-UBC Distinguished Colloquium, TitleTBA
ESB 2012 (PIMS) Time and date to be confirmed
Fri 10 Oct 2014, 3:00pm-4:00pm

Abstract


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Univeristy of Michigan
Fri 31 Oct 2014, 3:00pm
Department Colloquium
ESB 2012 (PIMS)
PIMS-IAM-UBC distinguished colloquium
ESB 2012 (PIMS)
Fri 31 Oct 2014, 3:00pm-4:00pm

Abstract


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TBA (reserved)
Fri 14 Nov 2014, 3:00pm
Department Colloquium
TBA
TBA
TBA
Fri 14 Nov 2014, 3:00pm-4:00pm

Abstract


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Caltech
Fri 30 Jan 2015, 3:00pm
Department Colloquium
ESB 2012 (PIMS) TBA (time and date to be confirmed)
PIMS-UBC distinguished colloquium
ESB 2012 (PIMS) TBA (time and date to be confirmed)
Fri 30 Jan 2015, 3:00pm-4:00pm

Abstract


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Brown University
Fri 13 Mar 2015, 3:00pm
Department Colloquium
ESB 2012 (PIMS)
PIMS-UBC Distinguished Colloquium, TitleTBA
ESB 2012 (PIMS)
Fri 13 Mar 2015, 3:00pm-4:00pm

Abstract


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