NAME: Ira Gessel

ADDRESS: Department of Mathematics, MS 050
         Brandeis University
         Waltham, MA 02454-9110

EMAIL: gessel@brandeis.edu

TITLE OF TALK: WZ forms and hypergeometric summation formulas

ABSTRACT OF TALK: The WZ method of Wilf and Zeilberger is a well known
technique for proving hypergeometric summation formulas. It can also
be used to find new summation formulas from old by duality. However,
one identity many have many different duals. WZ forms, introduced by
Zeilberger in 1993, give a way of systematizing this use of duality,
and of unifying many apparently different identities.