2 problems

Let $(F,g)$ be a polarized irreducible holomorphic symplectic fourfold deformation equivalent to $S^{[2]}$, and let $E^*_{\mathrm{nod}}$ be the classes corresponding to the extrema…

Let $(F,g)$ be a polarized irreducible holomorphic symplectic fourfold deformation equivalent to $S^{[2]}$, where $S$ is a K3 surface. Let $\mathrm{N}^1_+(F,g)$ be the positive hal…