Lie algebras

Linear Lie algebra

In algebra, a linear Lie algebra is a subalgebra of the Lie algebra 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 (in fact, on a finite-dimensional vector space by Ado's theorem if is itself finite-dimensional.) Let V be a finite-dimensional vector space over a field of characteristic zero and a subalgebra of . Then V is semisimple as a module over 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). (Wikipedia).

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Related pages

Ado's theorem | Vector space | Diagonalizable matrix | Lie algebra representation | Lie algebra | Endomorphism