Friday, 6 July 2012

ag.algebraic geometry - Vanishing of Self-Ext groups of vector bundles

Let E be a rank two vector bundle on mathbbPn. Assume that textExt1(E,E)=0. Will textExt2(E,E) be zero? Why? Any geometric explanation (in terms of deformation theory?)?



Edit: As pointing out by Angelo, in the case n=2, the answer is no. However, I really want to know when ngeq4.

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