2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/62729New estimates are derived concerning the behavior of self-dual hamonic 2-forms on a compact Riemannian 4-manifold with non-trivial Seiberg-Witten invariants. Applications include a vanishing theorem for certain Seiberg-Witten invariants on compact 4-manifolds of constant negative sectional curvature.22 pages, LaTeX2eDifferential GeometryGeometric Topology53C21; 57R57text