2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/59158We describe two topologies on the space of unbounded Fredholm operators and we explain their K-theoretic relevance. In the process we also prove a very general result concerning the continuity of families of first order, elliptic boundary value problems.11pagesDifferential GeometryAnalysis of PDEsAlgebraic TopologyFunctional Analysis58J32, 47A53, 47A55, 19L99text