## Dual involution on the Ext1Ext^1

Let X be a smooth algebraic curve over C, and let F be a vector bundle on it of degree 1, take the dual of an extention 0→F∗→E→F→0 is again an extension of F by F∗, my questions are: How can I explicitly describe this involution on vector space Ext1(F,F∗)? Are there any criterian for … Read more