Finite order automorphisms and real forms of affine Kac-Moody algebras in the smooth and algebraic category

Details Finite order automorphisms and real forms of affine Kac-Moody algebras in the smooth and algebraic category Finite order automorphisms and real forms of affine Kac-Moody algebras in the smooth and algebraic category

2009-03-31

arxiv.org/abs/0903.5431v1

Mathematics

Rings and Algebras

Scientific paper

Automorphisms of finite order and real forms of "smooth" affine Kac-Moody algebras are studied, i.e. of 2-dimensional extensions of the algebra of smooth loops in a simple Lie algebra. It is shown that they can be parametrized by certain invariants and that in particular the classification of involutions essentially follows from Cartan's classifications in finite dimensions. We also prove that our approach works equally well in the usual algebraic setting and leads to the same results there.

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