%0 Journal Article
%T Tangent spaces to metric spaces and to their subspaces
%A O. Dovgoshey
%J Mathematics
%D 2009
%I arXiv
%X We 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.
%U http://arxiv.org/abs/0904.4347v1