Characterization of hyperbolicity and generalized shadowing lemma

Details Characterization of hyperbolicity and generalized shadowing lemma Characterization of hyperbolicity and generalized shadowing lemma

2011-07-16

arxiv.org/abs/1107.3216v1

Mathematics

Dynamical Systems

Scientific paper

J. Mather characterized uniform hyperbolicity of a discrete dynamical system as equivalent to invertibility of an operator on the set of all sequences bounded in norm in the tangent bundle of an orbit. We develop a similar characterization of nonuniform hyperbolicity and show that it is equivalent to invertibility of the same operator on a larger, Fr\'echet space. We apply it to obtain a condition for a diffeomorphism on the boundary of the set of Anosov diffeomorphisms to be nonuniformly hyperbolic. Finally we generalise the Shadowing lemma in the same context.

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