2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/116465We prove that the Auslander class determined by a semidualizing module is the left half of a perfect cotorsion pair. We also prove that the Bass class determined by a semidualizing module is preenveloping.15 pagesCommutative Algebra13D05, 13D07, 13D25text