2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/104769Due to a significant error in the main result (pointed out by J. Wahl), the paper has been withdrawn by the authors. A corrected and expanded version is 'Rational blow-downs and smoothings of surface singularities' by A. Stipsicz, Z. Szabo and J. Wahl.The paper is withdrawn by the authorsGeometric TopologySymplectic Geometrytext