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arXiv 1202.4904math.NTmath.DS
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关于Diophantine展开式的丢番图性质

On the Diophantine properties of lambda-expansions

Tomas Persson, Henry W. J. Reeve

摘要:

对于$λ\in (1/2, 1)$和$α$,我们考虑数集$x$,使得对于无穷多个$n$,$x$是$2^{-αn}$ -接近某个$\sum_{i=1}^n ω_i λ^i$,其中$ω_i \in \{0,1\}$。这些集合在对于某些$s$的Hausdorff维数$s$的Falconer交集类中,使得$- \frac{1}α \frac{\log λ}{\log 2} \leq s \leq \frac{1}α$。我们发现,几乎所有的$λ\in (1/2, 2/3)$,上界的$s$是最佳的,但对于可数无穷的值的$λ$的下限是最好的结果。

英文摘要:

For $λ\in (1/2, 1)$ and $α$, we consider sets of numbers $x$ such that for infinitely many $n$, $x$ is $2^{-αn}$-close to some $\sum_{i=1}^n ω_i λ^i$, where $ω_i \in \{0,1\}$. These sets are in Falconer's intersection classes for Hausdorff dimension $s$ for some $s$ such that $- \frac{1}α \frac{\log λ}{\log 2} \leq s \leq \frac{1}α$. We show that for almost all $λ\in (1/2, 2/3)$, the upper bound of $s$ is optimal, but for a countable infinity of values of $λ$ the lower bound is the best possible result.

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