Torelli's theorem for high degree symmetric products of curves
arXiv:math/0208180
Abstract
We show that two smooth projective curves C_1 and C_2 of genus g which have isomorphic symmetric products are isomorphic unless g=2. This extends a theorem of Martens.
D. Huybrechts has pointed out an error in the proof when g = 2. Also, we were recently informed that the result in the case g > 2 was proved earlier by Ciliberto and Miranda in "On the symmetric products of a curve", Arch. Math. (61), 285-290, 1993