2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/228714We investigate a tangent space at a point of a general metric space and metric space valued derivatives. The conditions under which two different subspace of a metric space have isometric tangent spaces in a common point of these subspaces are completely determinated.18 pagesMetric Geometry54E35Tangent spaces to metric spaces and to their subspacestext