Remarks on Ruled surfaces and rank two bundles with canonical determinant and 4 sections

Abel Castorena, Graciela Reyes-Ahumada

Let $C$ be a smooth irreducible complex projective curve of genus $g$ and let $B^k(2,K_C)$ be the Brill-Noether loci parametrizing classes of (semi)-stable vector bundles $E$ of ra…