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Automorphisms of elementary adjoint Chevalley groups of types Al, Dl, El over local rings with 1/2

E. I. Bunina

math.GRarXiv:math/0702046

Abstract

In the paper we prove that every automorphism of and elementary adjoint Chevalley group of types Al, Dl, or El, over local commutative ring with 1/2 is a composition of a ring automorphism and conjugation by some matrix from the normalizer of the Chevalley group in (V) (V is the adjoint representation space).

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