2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/77882In this paper, some particular rational maps P_n ---> P_n+1, called quadratic congruences, are studied. They appear in the theory of exceptional vector bundles on projective spaces.34 pages, LaTeX 2e, 3 figuresAlgebraic Geometry14Etext