A positive Lyapunov exponent for the critical value of an \(S\)-unimodal mapping implies uniform hyperbolicity. (English) Zbl 0638.58021

A positive Lyapunov exponent for the critical value of an \(S\)-unimodal mapping implies a positive Lyapunov exponent of the backward orbit of the critical point, uniform hyperbolic structure on the set of periodic points and an exponential diminution of the length of the intervals of monotonicity. This is the proof of the Collet-Eckmann conjecture from 1981 in the general case [P. Collet and J. Eckmann, Ergodic Theory Dyn. Syst. 3, 13–46 (1983; Zbl 0532.28014)].
Reviewer: T.Nowicki


37D20 Uniformly hyperbolic systems (expanding, Anosov, Axiom A, etc.)
37A05 Dynamical aspects of measure-preserving transformations
28D05 Measure-preserving transformations


Zbl 0532.28014
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