"This self-contained monograph will be of interest to graduate students and researchers of dynamical systems and differential geometry. Numerous exercises and e

This ENCYCLOPAEDIA OF MATHEMATICS aims to be a reference work for all parts of mathe matics. It is a translation with updates and editorial comments of the Sovi

Singular spaces with upper curvature bounds and, in particular, spaces of nonpositive curvature, have been of interest in many fields, including geometric (and