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Rotation vectors and entropy for homeomorphisms of the torus isotopic to the identity

Published online by Cambridge University Press:  19 September 2008

J. Llibre
Affiliation:
Departament de Matemàtiques, Universitat Autonoma de Barcelona, Bellaterra, 08193 Barcelona, Spain
R. S. Mackay
Affiliation:
Nonlinear Systems Laboratory, Mathematics Institute, University of Warwick, Coventry CV47AL, England

Abstract

We show that if a homeomorphism f of the torus, isotopic to the identity, has three or more periodic orbits with non-collinear rotation vectors, then it has positive topological entropy. Furthermore, for each point ρ of the convex hull Δ of their rotation vectors, there is an orbit of rotation vector ρ, for each rational point p/q, p ∈ ℤ2, q ∈ ℕ, in the interior of Δ, there is a periodic orbit of rotation vector p / q, and for every compact connected subset C of Δ there is an orbit whose rotation set is C. Finally, we prove that f has ‘toroidal chaos’.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1991

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