$\mathcal{C}^2$ surface diffeomorphisms have symbolic extensions

Details $\mathcal{C}^2$ surface diffeomorphisms have symbolic extensions $\mathcal{C}^2$ surface diffeomorphisms have symbolic extensions

2009-12-10

arxiv.org/abs/0912.2018v2

Mathematics

Dynamical Systems

Scientific paper

We prove that $\mathcal{C}^2$ surface diffeomorphisms have symbolic extensions, i.e. topological extensions which are subshifts over a finite alphabet. Following the strategy of T.Downarowicz and A.Maass \cite{Dow} we bound the local entropy of ergodic measures in terms of Lyapunov exponents. This is done by reparametrizing Bowen balls by contracting maps in a approach combining hyperbolic theory and Yomdin's theory.

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