2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/224070In the present paper, the Lindelof number and the degree of compactness of spaces and of the cozero-dimensional kernel of paracompact spaces are characterized in terms of selections of lower semi-continuous closed-valued mappings into complete metrizable (or discrete) spaces.23 pagesGeneral Topology54C60, 54C65, 54D20, 54D30.text