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arXiv 1901.01064math.DS
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连续区间映射的稠密混沌

Dense chaos for continuous interval maps

Sylvie Ruette

摘要:

从紧区间$I$到其自身的连续映射$f$是稠密的(分别是)。一般地)混沌的,如果使得$\limsup_{n\to+\infty}|f^n(x)-f^n(y)|>0$和$\liminf_{n\to+\infty} |f^n(x)-f^n(y)|=0$是稠密的点集合$(x,y)$(分别为残留)。证明了如果区间映射$f$是稠密的但不是一般混沌的,则存在不变区间的降序序列,每个不变区间包含$f^2$的一个马蹄形.这意味着每一个稠密混沌区间映射对于Sharkovsky阶至多是$6$型的(即存在一个周期为$6$的周期点),并且它的拓扑熵至少是$\log 2/2$ .我们表明,平等是可以实现的。

英文摘要:

A continuous map $f$ from a compact interval $I$ into itself is densely (resp. generically) chaotic if the set of points $(x,y)$ such that $\limsup_{n\to+\infty}|f^n(x)-f^n(y)|>0$ and $\liminf_{n\to+\infty} |f^n(x)-f^n(y)|=0$ is dense (resp. residual) in $I\times I$. We prove that if the interval map $f$ is densely but not generically chaotic then there is a descending sequence of invariant intervals, each of which containing a horseshoe for $f^2$. It implies that every densely chaotic interval map is of type at most $6$ for Sharkovsky's order (that is, there exists a periodic point of period $6$), and its topological entropy is at least $\log 2/2$. We show that equalities can be realised.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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