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Mar 26, 2017 at 20:11 comment added YCor Strictly speaking, graphs are negatively curved (locally $CAT(-1)$, and indeed locally CAT($-\infty$)) and are the most obvious counterexamples.
Mar 26, 2017 at 15:28 answer added Jean Raimbault timeline score: 6
Mar 26, 2017 at 10:58 review First posts
Mar 26, 2017 at 10:59
Mar 26, 2017 at 10:54 history asked Peter CC BY-SA 3.0