2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/71344We define three new homological dimensions - Cohen-Macaulay injective, projective, and flat dimension - which inhabit a theory similar to that of classical injective, projective, and flat dimension. Finiteness of the new dimensions characterizes Cohen-Macaulay rings with dualizing modules.18 pagesCommutative Algebra13D05, 13D25text