Piecewise smooth one dimensional maps with nowhere vanishing derivative

Details Piecewise smooth one dimensional maps with nowhere vanishing derivative Piecewise smooth one dimensional maps with nowhere vanishing derivative

1996-05-15

arxiv.org/abs/math/9605229v1

Mathematics

Dynamical Systems

Scientific paper

We consider the dynamics of `nonlinear tent maps': piecewise smooth unimodal maps with nowhere vanishing derivative. We show that if a nonlinear tent map $f$ is not infinitely renormalizable, then all its periodic orbits of sufficiently high period are hyperbolic repelling. If additionally all periodic orbits of $f$ are hyperbolic, then $f$ has at most finitely many periodic attractors and there is a hyperbolic expansion outside the basins of these periodic attractors. In particular, if a nonlinear tent map $f$ is not infinitely renormalizable and all its periodic orbits are hyperbolic repelling, then some iterate of $f$ is expanding. In this case, $f$ admits an absolutely continuous invariant probability measure.

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