Conjugacy theorems for loop reductive group schemes and Lie algebras

Details Conjugacy theorems for loop reductive group schemes and Lie algebras Conjugacy theorems for loop reductive group schemes and Lie algebras

2011-09-24

arxiv.org/abs/1109.5236v1

Mathematics

Rings and Algebras

Scientific paper

The conjugacy of split Cartan subalgebras in the finite dimensional simple case (Chevalley) and in the symmetrizable Kac-Moody case (Peterson-Kac) are fundamental results of the theory of Lie algebras. Among the Kac-Moody Lie algebras the affine algebras stand out. This paper deals with the problem of conjugacy for a class of algebras --extended affine Lie algebras-- that are in a precise sense higher nullity analogues of the affine algebras. Unlike the methods used by Peterson-Kac, our approach is entirely cohomological and geometric. It is deeply rooted on the theory of reductive group schemes developed by Demazure and Grothendieck, and on the work of J. Tits on buildings

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