2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/115145The paper describes how known results in Heegaard-Floer homology apply to all known examples of rational blow-downs, and provides several new four dimensional pieces which could be exchanged while preserving some of the Ozsváth-Szabó four manifold invariants, when one of these pieces is found embedded in a smooth four manifold.30 pages, many diagrams, uses dcpicGeometric Topologytext