Izadi's base-locus conjecture for Prym second-order theta divisors
Izadi's base-locus conjecture for Prym second-order theta divisors
Let be a Prym variety associated with a double cover , and let be the relevant Prym-theta subvariety. Let consist of sections in whose restriction to vanishes, let be its projectivized linear system, and let be its base locus. Let be the corresponding system of quartic tangent cones at the origin, with base locus . Let denote the Prym-canonical image of in , where is the square-trivial invertible sheaf associated with . Izadi's Prym base-locus conjecture. If is not a Jacobian, then
- as a set if ;
- as a set if .
This conjecture asks whether the restricted second-order theta systems detect precisely the Prym-theta subvariety and its Prym-canonical tangent-cone curve away from the Jacobian locus. The source poses it after proving dimension and codimension bounds; no resolution is specified here.
Sources & referencesView supporting material
Primary source
E. Izadi, “Second order theta divisors on Pryms”, arXiv:alg-geom/9704020 (1997).
Progress summary
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