Lie algebras are algebraic structures which were introduced to study the concept of infinitesimal transformations. The term "Lie algebra" (after Sophus Lie) was introduced by Hermann Weyl in the 1930s. In older texts, the name "infinitesimal group" is used. Related mathematical concepts include Lie groups and differentiable manifolds. See also the Wiki page.
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Sums of degrees of irreducible complex charactersSums of degrees of irreducible complex characters
Nilradical of a Lie algebra associated to a associative algebra
Variety of nilpotent Lie algebras or $p$-groups
Why the Killing form?
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