2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/156035We define quasi-Frobenius semigroups and find necessary and sufficient conditions under which a semigroup algebra of a 0-cancellative semigroup is quasi-Frobenius.6 pages, LatexRings and Algebras16L60; 20M25text