Locus of indeterminacy of the Prym map
arXiv:math/0103167
Abstract
We provide an easy characterization for the locus of indeterminacy of the Prym map in terms of the dual graphs of stable curves. As a corollary, we show that the closure of the Fridman-Smith locus coincides with the locus of indeterminacy of the Prym map.
7 pages