Abstract:Let G be the wonderful compactification of a simple affine algebraic group G of adjoint type defined over C. Let T ⊂ G be the closure of a maximal torus T ⊂ G. We prove that the group of all automorphisms of the variety T is the semi-direct product N G (T ) ⋊ D, where N G (T ) is the normalizer of T in G and D is the group of all automorphisms of the Dynkin diagram, if G = PSL(2, C). Note that if G = PSL(2, C), then T = CP 1 and so in this case Aut(T ) = PSL(2, C).Résumé. Le groupe complet des automorphismes d… Show more
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