pith. sign in

arxiv: 1906.03649 · v1 · pith:ENM4PXVEnew · submitted 2019-06-09 · 🧮 math.DS

Interval maps of given topological entropy and Sharkovskii's type

classification 🧮 math.DS
keywords entropylambdatypeeverytopologicalintervalpositivesharkovskii
0
0 comments X
read the original abstract

It is known that the topological entropy of a continuous interval map $f$ is positive if and only if the type of $f$ for Sharkovskii's order is $2^d p$ for some odd integer $p\ge 3$ and some $d\ge 0$; and in this case the topological entropy of $f$ is greater than or equal to $\frac{\log\lambda_p}{2^d}$, where $\lambda_p$ is the unique positive root of $X^p-2X^{p-2}-1$. For every odd $p\ge 3$, every $d\ge 0$ and every $\lambda\ge\lambda_p$, we build a piecewise monotone continuous interval map that is of type $2^dp$ for Sharkovskii's order and whose topological entropy is $\frac{\log\lambda}{2^d}$. 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 $d=0$ the map we build is topologically mixing.

This paper has not been read by Pith yet.

discussion (0)

Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.