On the Diophantine properties of lambda-expansions

Details On the Diophantine properties of lambda-expansions On the Diophantine properties of lambda-expansions

2012-02-22

arxiv.org/abs/1202.4904v1

Mathematics

Number Theory

21 pages

Scientific paper

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

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