Extremal effective divisors of Brill-Noether and Gieseker-Petri type in M1,n
Abstract
We show that certain divisors of Brill-Noether and Gieseker-Petri type span extremal rays of the effective cone in the moduli space of stable genus one curves with n ordered marked points. In particular, they are different from the infinitely many extremal rays found in ChenCoskun.
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