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Aug 14, 2016 at 18:45 comment added YCor No he doesn't define "arête" (edge) to be "extrémité" (ending edge). He says that an (oriented) "arête" is defined to be an "extrémité" if (something which amounts to saying that it source is an extremal vertex).
Aug 14, 2016 at 18:14 comment added Ian Agol You're aware of Serre's book? link.springer.com/book/10.1007/978-3-642-61856-7
Aug 14, 2016 at 17:42 history asked MathStudent CC BY-SA 3.0