2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/164837Using the methods developed for the proof that the 2-universality criterion is unique, we partially characterize criteria for the n-universality of positive-definite integer-matrix quadratic forms. We then obtain the uniqueness of Oh's 8-universality criterion as an application of our characterization results.4 pagesNumber Theory11E20, 11E25text