2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/74029The purpose of this paper is to present some results on the existence of homologous, nonisotopic symplectic or lagrangian surfaces embedded in a simply connected symplectic 4-dimensional manifold.13 pages, 5 figures. Survey paper to appear in the Proceedings of the Fields-McMaster Conference on Geometry and Topology of ManifoldsGeometric TopologySymplectic Geometry57R57; 57R17text