%0 Journal Article
%T Hyperbolicity, CAT(-1)-spaces and the Ptolemy Inequality
%A Thomas Foertsch
%A Viktor Schroeder
%J Mathematics
%D 2006
%I arXiv
%X Using a four points inequality for the boundary of CAT(-1)-spaces, we study the relation between Gromov hyperbolic spaces and CAT(-1)-spaces.
%U http://arxiv.org/abs/math/0605418v2