2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/139037We give characterizations of the Borel sets potentially in some Wadge class, among the Borel sets with countable vertical sections of a product of two Polish spaces. To do this, we use some partial uniformization results.LogicGeneral Topology54H05, 03D80, 03E15, 26A21, 28A05, 54C65, 54E52text