Date & Time: Thursday, October 22, 2009, 16:00-17:00.
Venue: Ramanujan Hall
Title: On the Basis Problem for Elliptic Modular Forms
Speaker: Siegfried Böcherer, Universität Mannheim
Abstract: Here we discuss, for a given genus of positive definite quadratic forms of squarefree level, which modular forms of squarefree level N can be represented by theta series from that genus; the case of newforms is well-known, but for the oldforms some surprising phenomenon arises, which is also interesting to compare with the representation theoretic theta correspondence (recent work of mine).