Semisimple Lie algebra

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What Wikipedia says

In mathematics, a Lie algebra is semisimple if it is a direct sum of simple Lie algebras. (A simple Lie algebra is a non-abelian Lie algebra without any non-zero proper ideals.)

Excerpt from the Wikipedia article “Semisimple Lie algebra”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

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