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Sep 26, 2016 at 16:58 comment added Fedor Petrov Kelly's proof on your link works in absolute geometry.
Sep 26, 2016 at 16:11 vote accept Ali Taghavi
Sep 26, 2016 at 14:45 comment added Neal Use the Klein model-- geodesics are straight lines.
Sep 26, 2016 at 14:44 answer added Ivan Izmestiev timeline score: 6
Sep 26, 2016 at 14:37 history asked Ali Taghavi CC BY-SA 3.0