Date & Time: Monday, May 21, 2010, 16:30-17:30.
Venue: Ramanujan Hall
Title: Some Applications of the Ping-Pong Lemma
Speaker: T. N. Venkataramanna, TIFR Mumbai
Abstract: The ping-pong lemma of J. Tits gives a criterion for a subgroup of an abstract group to be a free product of two smaller group. Using this criterion, we construct Zariski dense discrete subgroups of the isometry group of the hyperbolic n-space, which are of infinite covolume.