Journal of Lie Theory Vol. 15, No. 2, pp. 589–594 (2005) 

Derivations of Locally Simple Lie AlgebrasKarlHermann Neeb%KarlHermann Neeb Technische Universität Darmstadt Schlossgartenstrasse 7 D64289 Darmstadt Deutschland neeb@mathematik.tudarmstadt.de Abstract: Let $\g$ be a locally finite Lie algebra over a field of characteristic zero which is a direct limit of finitedimensional simple ones. In this short note it is shown that each invariant symmetric bilinear form on $\g$ is invariant under all derivations and that each such form defines a natural embedding der$ \g \to \g^*$. The latter embedding is used to determine der$ \g$ explicitly for all locally finite split simple Lie algebras. Keywords: Locally finite Lie algebra, simple Lie algebra, derivation, direct limit Classification (MSC2000): 17B65, 17B20, 17B56 Full text of the article: (for faster download, first choose a mirror)
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