Automorphisms of Chevalley groups of types $A_l, D_l, E_l$ over local rings with 1/2

Details Automorphisms of Chevalley groups of types $A_l, D_l, E_l$ over local rings with 1/2 Automorphisms of Chevalley groups of types $A_l, D_l, E_l$ over local rings with 1/2

2009-07-31

arxiv.org/abs/0907.5595v2

Mathematics

Group Theory

18 pages

Scientific paper

In the paper we prove that every automorphism of a (elementary) Chevalley
group of type $A_l, D_l$, or $E_l$, $l\geqslant 2$, over a commutative local
ring with 1/2 is standard, i. e., is the composition of inner, ring, graph and
central automorphisms.

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