2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/150027We give a short proof for the fact that rationality of complex surfaces is a property depending only on the differential structure. Our proof uses the new Seiberg-Witten invariants.(to appear in Comptes Rendus), 6 pages, LATEXAlgebraic Geometrytext