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Nov 29, 2018 at 4:08 vote accept H-H
Nov 28, 2018 at 17:00 comment added Ben McKay The general story is explained in Sharpe's book Differential Geometry: Cartan's Generalization of Klein's Erlangen Programme, but the argument is precisely Petrunin's below.
Nov 28, 2018 at 5:19 answer added Anton Petrunin timeline score: 10
Nov 28, 2018 at 5:04 history asked H-H CC BY-SA 4.0