The Entropy Conjecture for Diffeomorphisms away from Tangencies

Details The Entropy Conjecture for Diffeomorphisms away from Tangencies The Entropy Conjecture for Diffeomorphisms away from Tangencies

2010-12-02

arxiv.org/abs/1012.0514v1

Mathematics

Dynamical Systems

15 pages

Scientific paper

We prove that every C1 diffeomorphism away from homoclinic tangencies is entropy expansive, with locally uniform expansivity constant. Consequently, such diffeomorphisms satisfy Shub's entropy conjecture: the entropy is bounded from below by the spectral radius in homology. Moreover, they admit principal symbolic extensions, and the topological entropy and metrical entropy vary continuously with the map. In contrast, generic diffeomorphisms with persistent tangencies are not entropy expansive and have no symbolic extensions.

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