Technion
 
Mathematics Colloquium
 
Speaker: Alexander Gamburd (CUNY Graduate Center)
 
Title: Expander Graphs, Thin Groups and Super-strong Approximation
 
Time: Monday, January 23, 3:30 pm
 
Place: Amado 232, Technion
 
Colloquium Homepage:  <http://www.technion.ac.il/~yehuday/colloquium/colloq.html>
 
Abstract: After introducing expander graphs and briefly discussing
Lubotzky-Weiss Independence Problem  for groups and expanders I will
talk about  recent developments pertaining to establishing the
expansion property for congruence quotients of thin groups --
discrete subgroups of semisimple groups which are Zariski dense but of
infinite index. This expansion property  can be viewed as a
far-reaching generalization of the strong approximation theorem  and
has many applications, in particular to affine linear sieve.
 
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Technion Math. Net (TECHMATH)
Editor: Michael Cwikel   <techm@math.technion.ac.il> 
Announcement from: Amir Yehudayoff   <amir.yehudayoff@gmail.com>