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HAUSDORFF DIMENSIONS OF SOME LIMINF SETS IN DIOPHANTINE APPROXIMATION

Part of: Classical measure theory Diophantine approximation, transcendental number theory Probabilistic theory: distribution modulo $1$; metric theory of algorithms

Published online by Cambridge University Press:  17 September 2014

Bao-Wei Wang ,
Zhi-Ying Wen  and
Jun Wu
Bao-Wei Wang
Affiliation:
School of Mathematics and Statistics, Huazhong University of Science and Technology, 430074 Wuhan, China email bwei_wang@hust.edu.cn
Zhi-Ying Wen
Affiliation:
Department of Mathematical Sciences, Tsinghua University, 10084 Beijing, China email wenzy@tsinghua.edu.cn
Jun Wu
Affiliation:
School of Mathematics and Statistics, Huazhong University of Science and Technology, 430074 Wuhan, China email jun.wu@mail.hust.edu.cn
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Abstract

Let $Q$ be an infinite subset of $\mathbb{N}$. For any ${\it\tau}>2$, denote $W_{{\it\tau}}(Q)$ (respectively $W_{{\it\tau}}$) to be the set of ${\it\tau}$ well-approximable points by rationals with denominators in $Q$ (respectively in $\mathbb{N}$). We consider the Hausdorff dimension of the liminf set $W_{{\it\tau}}\setminus W_{{\it\tau}}(Q)$ after Adiceam. By using the tools of continued fractions, it is shown that if $Q$ is a so-called $\mathbb{N}\setminus Q$-free set, the Hausdorff dimension of $W_{{\it\tau}}\setminus W_{{\it\tau}}(Q)$ is the same as that of $W_{{\it\tau}}$, i.e. $2/{\it\tau}$.

MSC classification

Primary: 11J83: Metric theory
Secondary: 11K55: Metric theory of other algorithms and expansions; measure and Hausdorff dimension 28A78: Hausdorff and packing measures
Type
Research Article
Information
Mathematika , Volume 61 , Issue 1 , January 2015 , pp. 101 - 120
Copyright
Copyright © University College London 2014 

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