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Irrational rotation factors for conservative torus homeomorphisms

Published online by Cambridge University Press:  08 March 2016

T. JÄGER
Affiliation:
Institute of Mathematics, FSU Jena, Germany email Tobias.Oertel-Jaeger@tu-dresden.de
F. TAL
Affiliation:
Universidade de São Paulo, Brasil email fabiotal@ime.usp.br
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Abstract

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We provide an equivalent characterization for the existence of one-dimensional irrational rotation factors of conservative torus homeomorphisms that are not eventually annular. It states that an area-preserving non-annular torus homeomorphism $f$ is semiconjugate to an irrational rotation $R_{\unicode[STIX]{x1D6FC}}$ of the circle if and only if there exists a well-defined speed of rotation in some rational direction on the torus, and the deviations from the constant rotation in this direction are uniformly bounded. By means of a counterexample, we also demonstrate that a similar characterization does not hold for eventually annular torus homeomorphisms.

Information

Type
Research Article
Copyright
© Cambridge University Press, 2016