2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/104967We show that there exists a natural counterpart of the Gromov-Hausdorff metric in the class of ultrametric spaces. It is proved, in particular, that the space of all ultrametric spaces whose metric take values in a fixed countable set is homeomorphic to the space of irrationals.5 pagesGeneral TopologyMetric Geometry54B20text