2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/141224Let p be a prime, G a locally finite p-group, K a commutative ring of characteristic p. The anti-automorphism g\mapsto g\m1 of G extends linearly to an anti-automorphism a\mapsto a^* of KG. An element a of KG is called symmetric if a^*=a. In this paper we answer the question: for which G and K do the symmetric units of KG form a multiplicative group.6 pagesRings and AlgebrasGroup Theory16U60 ; 16S34text