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    Killing Form

    Definition

    The Killing form is an inner product on a finite dimensional Lie algebra g defined by B(X, Y) = Tr(ad(X) ad(Y)) in the adjoint representation, where ad(X) is the adjoint representation of X. (-1) is adjoint-invariant in the sense that B(ad(X) Y, Z) = - B(Y, ad(X) Z). When g is a semisimple Lie algebra, the Killing form is nondegenerate.

    Associated person

    Wilhelm Karl Joseph Killing

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