Classical semi-simple ring

An associative right (or, equivalently, left) Artinian ring with zero Jacobson radical. The Wedderburn–Artin theorem describes the structure of the classical semi-simple rings. The class of classical semi-simple rings can also be characterized by homological properties (see Homological classification of rings). Every group algebra of a finite group over a field of characteristic coprime with the order of the group is a classical semi-simple ring. Commutative classical semi-simple rings are finite direct sums of fields. Connected with classical semi-simple rings is Goldie's theorem, which states that a ring has a left classical ring of fractions that is a classical semi-simple ring if and only if it satisfies the maximum condition for left annihilators and does not contain any infinite direct sums of left ideals.