2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/156664The isomorphism of 0-homology groups of a categorical at zero semigroup and homology groups of its 0-reflector is proved. Some applications of 0-homology to Eilenberg-MacLane homology of semigroups are given.16 pages, LatexK-Theory and HomologyRings and Algebras20M50text