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Linear Lie algebra
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Linear Lie algebra : ウィキペディア英語版
Linear Lie algebra
In algebra, a linear Lie algebra is a subalgebra \mathfrak of the Lie algebra \mathfrak(V) consisting of endomorphisms of a vector space ''V''. In other words, a linear Lie algebra is the image of a Lie algebra representation.
Any Lie algebra is a linear Lie algebra in the sense that there is always a faithful representation of \mathfrak (in fact, on a finite-dimensional vector space by Ado's theorem if \mathfrak is itself finite-dimensional.)
Let ''V'' be a finite-dimensional vector space over a field of characteristic zero and \mathfrak a subalgebra of \mathfrak(V). Then ''V'' is semisimple as a module over \mathfrak if and only if (i) it is a direct sum of the center and a semisimple ideal and (ii) the elements of the center are diagonalizable (over some extension field).
== Notes ==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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