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arXiv 1107.3945math.DS
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非游荡点的Sharkovskii序

Sharkovskii order for non-wandering points

M. Carvalho, F. Moreira

摘要:

对于映射$f:I \rightarrow I$,如果对于所有$0<j<p$为$f^p(x)=x$和$f^j(x)\not=x$,则点$x \in I$是周期性的,周期为$p \in \mathbb{N}$。当$f$是连续的并且$I$是区间时,Sharkovskii(\cite{BC})的定理指出在$\mathbb{N}$中存在一个序,比如$\lhd$,使得如果$f$有一个周期为$p$和$p \lhd q$的周期点,则$f$也有一个周期为$q$的周期点。在这项工作中,我们将看到如何扩展这个顺序$\lhd$的整数的超幂产生一个Sharkovskii型的结果,非游荡点的$f$。

英文摘要:

For a map $f:I \rightarrow I$, a point $x \in I$ is periodic with period $p \in \mathbb{N}$ if $f^p(x)=x$ and $f^j(x)\not=x$ for all $0<j<p$. When $f$ is continuous and $I$ is an interval, a theorem due to Sharkovskii (\cite{BC}) states that there is an order in $\mathbb{N}$, say $\lhd$, such that, if $f$ has a periodic point of period $p$ and $p \lhd q$, then $f$ also has a periodic point of period $q$. In this work, we will see how an extension of this order $\lhd$ to an ultrapower of the integer numbers yields a Sharkovskii-type result for non-wandering points of $f$.

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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