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arXiv 1301.3595math.DS
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Bete展开式动力系统中1轨道的丢番图逼近

Diophantine approximation of the orbit of 1 in the dynamical system of bete expansions

Bing Li, Tomas Persson, Baowei Wang, Jun Wu

摘要:

我们考虑了数1在$β$变换$T_β$下的轨道随$β$变化的分布.主要地,对于给定点可以很好地近似为1的轨道的$β>1$的集合的大小由其Hausdorff维数来测量。即,确定以下集合$$ E\big({\ell_n}_{n\ge 1}, x_0\big)=\Big{β>1: |T^n_β1-x_0|<β^{-\ell_n}, {for infinitely many} n\in \N\Big} $$的维数,其中$x_0$是$[0,1]$中的给定点,而${\ell_n}_{n\ge 1}$是作为$n\to \infty$趋于无穷大的整数序列。为了证明这一结果,引入了符号空间中词的递归时间的概念来刻画参数空间${β\in \R: β>1}$中圆柱体(在1的展开式中具有公共前缀的$β$的集合)的长度和分布.

英文摘要:

We consider the distribution of the orbits of the number 1 under the $β$-transformations $T_β$ as $β$ varies. Mainly, the size of the set of $β>1$ for which a given point can be well approximated by the orbit of 1 is measured by its Hausdorff dimension. That is, the dimension of the following set $$ E\big({\ell_n}_{n\ge 1}, x_0\big)=\Big{β>1: |T^n_β1-x_0|<β^{-\ell_n}, {for infinitely many} n\in \N\Big} $$ is determined, where $x_0$ is a given point in $[0,1]$ and ${\ell_n}_{n\ge 1}$ is a sequence of integers tending to infinity as $n\to \infty$. For the proof of this result, the notion of the recurrence time of a word in symbolic space is introduced to characterize the lengths and the distribution of cylinders (the set of $β$ with a common prefix in the expansion of 1) in the parameter space ${β\in \R: β>1}$.

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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