Semisimple meaning

(mathematics, of a module) In which each submodule is a direct summand.
adjective
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(mathematics, of an algebra or ring)
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(mathematics, of an operator or matrix) For which every invariant subspace has an invariant complement, equivalent to the minimal polynomial being squarefree.
adjective
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(mathematics, of a Lie algebra) Being a direct sum of simple Lie algebras.
adjective
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(mathematics, of an algebraic group) Being a linear algebraic group whose radical of the identity component is trivial.
adjective
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Origin of semisimple

  • semi- +‎ simple

    From Wiktionary