English

Interval maps of given topological entropy and Sharkovskii's type

Dynamical Systems 2019-06-11 v1

Abstract

It is known that the topological entropy of a continuous interval map ff is positive if and only if the type of ff for Sharkovskii's order is 2dp2^d p for some odd integer p3p\ge 3 and some d0d\ge 0; and in this case the topological entropy of ff is greater than or equal to logλp2d\frac{\log\lambda_p}{2^d}, where λp\lambda_p is the unique positive root of Xp2Xp21X^p-2X^{p-2}-1. For every odd p3p\ge 3, every d0d\ge 0 and every λλp\lambda\ge\lambda_p, we build a piecewise monotone continuous interval map that is of type 2dp2^dp for Sharkovskii's order and whose topological entropy is logλ2d\frac{\log\lambda}{2^d}. This shows that, for a given type, every possible finite entropy above the minimum can be reached provided the type allows the map to have positive entropy. Moreover, if d=0d=0 the map we build is topologically mixing.

Keywords

Cite

@article{arxiv.1906.03649,
  title  = {Interval maps of given topological entropy and Sharkovskii's type},
  author = {Sylvie Ruette},
  journal= {arXiv preprint arXiv:1906.03649},
  year   = {2019}
}

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10 pages