Idempotents in group rings
Idempotents in group rings
The following result generalizes a corollary of a theorem due to Swan [l, p. 571 ].1 Swan's theorem deals with Dedekind rings of characteristic 0.Theorem.Let R be an integral domain iwith I), and let Gbe a finite group of order n.Then the group ring RG has an idempotent different from …