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Orthogonal symmetric Lie algebra : ウィキペディア英語版 | Orthogonal symmetric Lie algebra In mathematics, an orthogonal symmetric Lie algebra is a pair consisting of a real Lie algebra and an automorphism of of order such that the eigenspace of ''s'' corrsponding to 1 (i.e., the set of fixed points) is a compact subalgebra. If "compactness" is omitted, it is called a symmetric Lie algebra. An orthogonal symmetric Lie algebra is said to be ''effective'' if intersects the center of trivially. In practice, effectiveness is often assumed; we do this in this article as well. The canonical example is the Lie algebra of a symmetric space, being the differential of a symmetry. Every orthogonal symmetric Lie algebra decomposes into a direct sum of ideals "of compact type", "of noncompact type" and "of Euclidean type". == References ==
* S. Helgason, ''Differential geometry, Lie groups, and symmetric spaces''
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