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arXiv math/0607025math.AG
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相干扭层的Gabriel定理

A Gabriel Theorem for Coherent Twisted Sheaves

Arvid Perego

摘要:

本文将凝聚层的Gabriel定理推广到域k上的光滑簇X上的凝聚扭层的情形。证明了范畴Coh(X,α)决定了X对α在X的Brauer群中的概型结构,并且Coh(X,α)与Coh(Y,β)之间的任何等价都诱导X与Y之间的同构.最后证明了D^b(X,α)的饱和性.

英文摘要:

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).

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