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Apr 9, 2016 at 16:39 history edited Denis Serre CC BY-SA 3.0
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Jun 9, 2012 at 7:17 comment added Denis Serre @Salvo. V. Arnold discusses the rotation number in his book "Mathematical methods of classical mechanics".
Jun 8, 2012 at 22:45 comment added Salvo Tringali Cool! Can you provide any conventional reference where it is actually possible to find the same kind of proof? That of Herman (M.R. Herman (1979), Sur la conjugaison différentiable des difféomorphismes du cercle à des rotations, Publ. Math. IHES, Vol. 49, pp. 5–234) looks different.
Jun 8, 2012 at 20:30 history answered Denis Serre CC BY-SA 3.0