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Extensions centrales d'algèbres de Lie

Christian Kassel, Jean-Louis Loday (1982)

Annales de l'institut Fourier

Soient k un anneau commutatif et A une k -algèbre associative quelconque. Nous calculons le groupe d’homologie H 2 ( 𝔰 l n ( A ) , k ) de la k -algèbre de Lie 𝔰 l n ( A ) des matrices de “trace nulle” sur A . Le groupe ainsi déterminé est un groupe d’homologie d’un complexe inspiré d’A. Connes; il est isomorphe à Ω A / k 1 / d A lorsque A est commutative. Nous obtenons également des résultats pour un groupe d’homologie relative associé à une surjection de k -algèbres. Les démonstrations utilisent la classification des extensions centrales et des...

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