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Jun 26, 2019 at 14:28 vote accept Loreno Heer
Jun 26, 2019 at 7:44 answer added Vladimir Zolotov timeline score: 3
Jun 21, 2019 at 18:43 comment added Loreno Heer @ClemensSämann As far as I understand the 4-point CAT condition would only work to show that the space can not be CAT. The 4-point condition for CBB spaces looks slightly different (7.1.3 in Alexandrov geometry: preliminary version no. 1, Alexander, Kapovitch, Petrunin) in the sense of which points are compared.
Jun 21, 2019 at 17:26 history edited YCor CC BY-SA 4.0
made more precise title
Jun 21, 2019 at 15:48 comment added Loreno Heer @ClemensSämann Yes but may need to check this again. Did not think I can use it here at first.
Jun 21, 2019 at 15:45 comment added Clemens Sämann Are you aware of the "4-point condition" for CAT(k) spaces, i.e., for CBA spaces, cf. Def. II.1.10., p. 164 in Metric spaces of non-positive curvature, Bridson-Haefliger? This looks similar and might give you some ideas...
Jun 21, 2019 at 15:39 history edited Loreno Heer CC BY-SA 4.0
edited title
Jun 21, 2019 at 15:13 history asked Loreno Heer CC BY-SA 4.0