2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/77836We prove Lefschetz type theorems for cohomology groups and Picard groups of degeneracy loci for vector bundle maps. We also treat the case of antisymmetric maps.In French. 21 pages. PlainTeX v 1.2; typeset for referencesAlgebraic Geometrytext