3:00 p.m., Friday (October 19, 2007)

Math Annex 1100

Nike Vatsal

Special values of L-functions modulo p

Abstract: It has been known since Euler that the values of the Riemann zeta function at negative integers are certain rational numbers, namely the Bernoulli numbers B_k. Similarly, the values of Dirichlet L-functions at s=0 are related to class numbers of certain number fields. These are simple instances of a common phenomenon, namely that the values of L-functions at critical points are algebraic, up to a simple factor, and that these algebraic numbers are related to algebraic quantities such as class numbers and Selmer groups. The present talk will be a survey talk on the algebraicity of special values of L-functions and their divisibility properties modulo primes.

Refreshments will be served at 2:45 p.m. (Math Lounge, MATX 1115).

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