semisimple

Etymology

semi- +‎ simple

Adjective

semisimple (not comparable)

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

Alternative forms

• semi-simple

Etymology

semi- +‎ simple

Adjective

semisimple (plural semisimples)

1. (mathematics) semisimple