# American Institute of Mathematical Sciences

May  2014, 34(5): 1933-1949. doi: 10.3934/dcds.2014.34.1933

## Period 3 and chaos for unimodal maps

 1 Department of Applied Mathematics, Chung Yuan Christian University, Chungli, Taiwan, Taiwan 2 Department of Financial and Computational Mathematics, Providence University, Taichung, Taiwan

Received  January 2013 Revised  July 2013 Published  October 2013

In this paper we study unimodal maps on the closed unit interval, which have a stable period 3 orbit and an unstable period 3 orbit, and give conditions under which all points in the open unit interval are either asymptotic to the stable period 3 orbit or land after a finite time on an invariant Cantor set $\Lambda$ on which the dynamics is conjugate to a subshift of finite type and is, in fact, chaotic. For the particular value of $\mu=3.839$, Devaney [3], following ideas of Smale and Williams, shows that the logistic map $f(x)=\mu x(1-x)$ has this property. In this case the stable and unstable period 3 orbits appear when $\mu=\mu_0=1+\sqrt{8}$. We use our theorem to show that the property holds for all values of $\mu>\mu_0$ for which the stable period 3 orbit persists.
Citation: Kaijen Cheng, Kenneth Palmer, Yuh-Jenn Wu. Period 3 and chaos for unimodal maps. Discrete & Continuous Dynamical Systems, 2014, 34 (5) : 1933-1949. doi: 10.3934/dcds.2014.34.1933
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