A Gabriel Theorem for Coherent Twisted Sheaves

Abstract

We give a generalization of Gabriel's Theorem on coherent sheaves to the case of coherent twisted sheaves on a smooth variety X over a field k. We show that the category Coh(X,α) determines the scheme structure of X for αin the Brauer group of X, and that any equivalence between Coh(X,α) and Coh(Y,β) induces an isomorphism between X and Y. In conclusion we prove the saturatedness of D^b(X,α).