The Derived Picard Group is a Locally Algebraic Group

Details The Derived Picard Group is a Locally Algebraic Group The Derived Picard Group is a Locally Algebraic Group

2000-04-30

arxiv.org/abs/math/0005005v2

Mathematics

Rings and Algebras

4 pages, AMSLaTeX, to appear in Algebr. Represent. Theory

Scientific paper

Let A be a finite dimensional algebra over an algebraically closed field K. The derived Picard group DPic(A) is the group of two-sided tilting complexes over A modulo isomorphism. We prove that DPic(A) is a locally algebraic group, and its identity component is Out^0(A). If B is a derived Morita equivalent algebra then DPic(A) is isomorphic to DPic(B) as locally algebraic groups. Our results extend, and our based on, work of Huisgen-Zimmermann, Saorin and Rouquier.

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