2 problems

Let $\overline M_{0,n}$ be the moduli space of stable genus-zero curves with $n$ marked points, with the natural action of the symmetric group $S_n$. A divisor is F-nef if it inter…

Let $\overline{M}_{0,n}$ be the moduli space of stable $n$-pointed rational curves, and let a line bundle be $\mathfrak{S}_n$-symmetric when it is invariant under permuting the mar…