Brill--Noether Generality of Curves and K3 Surfaces
Lazarsfeld proved Brill--Noether generality of any smooth curve in the linear system $|H|$ where $(X,H)$ is a polarized K3 surface with $\operatorname{Pic}(X) = \mathbb{Z}\cdot H$. Mukai introduced the notion of Brill--Noether generality for quasi-polarized K3 surfaces. We prove Brill--Noether generality of any smooth curve in the linear system $|H|$ where $(X,H)$ is a Brill--Noether general quasi-polarized K3 surface. We also prove that Petri homomorphism is an isomorphism for each extremal line bundle on a general curve $C \in |H|$.
math.AG↗