2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/77654The goal of this paper is to demonstrate that, at least for nonsimply connected 4-manifolds, the Seiberg-Witten invariant alone does not determine diffeomorphism type within the same homeomorphism type.9 pages. Published copy, also available at http://www.maths.warwick.ac.uk/gt/GTMon2/paper5.abs.htmlSymplectic GeometryGeometric Topology57N13, 57MXXtext