noun which may take the genitive case particle 'no'
semisimple
Mathematics term used for algebraic structures such as rings, modules, or Lie algebras that decompose into a direct sum of simple subobjects.
半単純リー環の分類は重要である。
The classification of semisimple Lie algebras is important.
Compound of 半 (half, semi-) and 単純 (simple). The term is a direct calque of the English 'semisimple' in mathematical contexts.