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The Coble quadric

The Coble quadric

Abstract Given a smooth genus three curve C , the moduli space of rank two stable vector bundles on C with trivial determinant embeds in ${\mathbb {P}}^8$ as a hypersurface whose singular locus is the Kummer threefold of C ; this hypersurface is the Coble quartic. Gruson, Sam and Weyman …