The Prym-Petri expectation for double covers of curves on Nikulin surfaces
Prym-Petri expectation. If −r≤ρ(2g−1,r,2g−2)<r-r\leq \rho(2g-1,r,2g-2)<r−r≤ρ(2g−1,r,2g−2)<r, then
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