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:  <>
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.
Technion Math. Net (TECHMATH)
Editor: Michael Cwikel   <> 
Announcement from: Amir Yehudayoff   <>