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Detailed view Article in peer-reviewed journal
JOURNAL OF MODERN DYNAMICS 5, 3 (2011) 583-591
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A non-differentiable essential irrational invariant curve for a $C^1$ symplectic twist map
Marie-Claude Arnaud1

We construct a $C^1$ symplectic twist map f of the annulus that has an essential invariant curve C such that: --C is not differentiable; -- the dynamic of f restricted to C is conjugated to the one of a Denjoy counter-example.
1:  LANLG - Laboratoire d'Analyse non linéaire et Géométrie
twist maps – invariant curves – Denjoy counter-examples