The Denjoy type-of argument for quasiperiodically forced circle diffeomorphisms
Tobias H. Jaeger, Gerhard Keller
Abstract
We carry the argument used in the proof of the Theorem of Denjoy over to the quasiperiodically forced case. Thus we derive that if a system of quasiperiodically forced circle diffeomorphisms with bounded variation of the derivative has no invariant graphs with a certain kind of topological regularity, then the system is topologically transitive.
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