Speaker: Professor Yifan Yang (National Chiao Tung University)
Title: Structure of the cuspidal rational torsion subgroup of J_1(N)
Time: 2008-12-11 (Thu.)  15:00 - 16:00
Abstract: Let X_1(N) be the modular curve associated to the congruence subgroup Gamma_1(N). Its Jacobian J_1(N) contains a rational torsion subgroup coming from the cuspidal divisors of X_1(N). In this talk we will discuss the structure of this rational torsion subgroup. In particular, we will present a structure theorem for the p-primary subgroup of J_1(p^n) in the case when p is a regular prime.
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