Review
"Recollects some basic properties as well as some fairly advanced results [which] is done with a spirit that allows one to understand that, even though the study of such manifolds has important differences from the flat case, some techniques come from the very elementary Euclidean geometry."
--Mathematical Reviews
Product Description
Discusses various geometric and analytic aspects of non-positive curvature, starting with Riemannian examples and rigidity theorems. Treats generalized notions of nonpositive curvature in the sense of Alexandrov and Busemann & the theory of harmonic maps with values in such spaces. Paper.
