Prym enumerative geometry and a Hurwitz divisor in ${\overline{\mathcal{R}}}_{2i}$

Andrei Bud

For $i\ge 2$, we compute the first coefficients of the class $[\overline{D}(\mu ;3)]$ in the rational Picard group of the moduli of Prym curves ${\overline{\mathcal{R}}}_{2i}$, where $D…