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Mar 26 at 21:12 comment added ZZZ @IgorBelegradek Thanks a lot for the references!
Mar 26 at 20:01 comment added Igor Belegradek A standard text for a graduate student would be "Metric Spaces of Non-Positive Curvature" by Bridson and Haefliger, which doesn't limit the discussion to Riemannian manifolds, but in fact the manifold case isn't easier. The books that focus on manifolds are "Manifolds of Nonpositive Curvature" by Ballmann, Gromov and Schroeder and Eberlein's "Geometry of Nonpositively Curved Manifolds".
Mar 26 at 19:49 comment added ZZZ @IgorBelegradek Thanks for the answer! Do you have a reference about this for non-experts?
Mar 26 at 16:25 history edited gmvh
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Mar 26 at 15:34 comment added Igor Belegradek There are two issues here: existence of a geodesic joining any two points at infinity and its uniqueness. Neither one is true for general Cartan-Hadamard manifolds. Those for which any two points at infinity are joined by a geodesic are called visibility manifolds. If the manifold contains a flat strip bounded by two bi-infinite geodesics, uniqueness fails.
Mar 26 at 15:27 comment added Moishe Kohan Did you think about the Euclidean plane? Do you know the flat strip theorem?
Mar 26 at 15:18 comment added ZZZ Hyperbolic space is true. Also, it should be true for manifolds with $\sec \leq -1$
Mar 26 at 15:11 comment added Moishe Kohan What examples did you check?
S Mar 26 at 14:49 review First questions
Mar 26 at 14:50
S Mar 26 at 14:49 history asked ZZZ CC BY-SA 4.0