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Foliations and conjugacy, II: the Mendes conjecture for time-one maps of flows

Published online by Cambridge University Press:  30 October 2020

JORGE GROISMAN
Affiliation:
Instituto de Matemática y Estadística Prof. Ing. Rafael Laguardia, Facultad de Ingeniería Julio Herrera y Reissig 565 11300, Montevideo, Uruguay (e-mail: jorgeg@fing.edu.uy)
ZBIGNIEW NITECKI*
Affiliation:
Department of Mathematics, Tufts University, Medford, MA 02155, USA

Abstract

A diffeomorphism of the plane is Anosov if it has a hyperbolic splitting at every point of the plane. In addition to linear hyperbolic automorphisms, translations of the plane also carry an Anosov structure (the existence of Anosov structures for plane translations was originally shown by White). Mendes conjectured that these are the only topological conjugacy classes for Anosov diffeomorphisms in the plane. Very recently, Matsumoto gave an example of an Anosov diffeomorphism of the plane, which is a Brouwer translation but not topologically conjugate to a translation, disproving Mendes’ conjecture. In this paper we prove that Mendes’ claim holds when the Anosov diffeomorphism is the time-one map of a flow, via a theorem about foliations invariant under a time-one map. In particular, this shows that the kind of counterexample constructed by Matsumoto cannot be obtained from a flow on the plane.

Type
Original Article
Copyright
© The Author(s), 2020. Published by Cambridge University Press

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