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Andrei Caldararu : Derived Categories of Twisted Sheaves

In my talk I shall try to explain the relationship of the Brauer group, derived categories of twisted sheaves, and physics. In particular, I shall attempt to relate an example due to Aspinwall-Morrison-Vafa-Witten to some examples that occur in the study of elliptic Calabi-Yau threefolds without sections.

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