2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/63989We prove (the excellent case of) Schreyer's conjecture that a local ring with countable Cohen--Macaulay type has at most a one-dimensional singular locus. Furthermore we prove that the localization of a Cohen-Macaulay local ring of countable CM type is again of countable CM type.6 pagesCommutative Algebra13C14text