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Koszul duality : ウィキペディア英語版
Koszul duality
In mathematics, Koszul duality, named after the French mathematician Jean-Louis Koszul, is any of various kinds of dualities found in representation theory of Lie algebras, abstract algebras (semisimple algebra)〔Ben Webster, (Koszul algebras and Koszul duality ). November 1, 2007〕 as well as topology (e.g., equivariant cohomology〔M. Goresky, R. Kottwitz, and R. MacPherson. Equivariant cohomology, Koszul duality, and the localization theorem. Invent. Math. 131 (1998).〕). The prototype example, due to Bernstein, Gelfand and Gelfand,〔I. Bernstein, I. Gelfand, S. Gelfand. ''Algebraic bundles over P^n and problems of linear algebra''. Funkts. Anal. Prilozh. 12 (1978); English translation in Functional Analysis and its Applications 12 (1978), 212-214〕 is the rough duality between the derived category of a symmetric algebra and that of an exterior algebra. The importance of the notion rests on the suspicion that Koszul duality seems quite ubiquitous in nature.
==Koszul duality for modules over Koszul algebras==


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