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arXiv 0710.4264math.NT
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丢番图逼近,Khintchine定理,环面几何和豪斯多夫维数

Diophantine approximation, Khintchine's theorem, torus geometry and Hausdorff dimension

M. M. Dodson

摘要:

讨论了Borel-Cantelli引理的一般形式及其与Khintchine关于丢番图逼近的定理证明和更一般的Khintchine-Groshev定理的关系。环面几何在平面的情况下允许一个相对直接的证明平面格罗谢夫定理的一组$ψ$ -逼近点在平面上。说明了Haudsorff测度和维数的构造和使用,并描述了泛在性的概念,它在估计相当一般的lim子集的豪斯多夫维数的下界时是有效的.应用平面Jarnik-Besicovich定理,得到了当$ψ(q)=q^{-v}$,$v>0$满足时,平面上可逼近点集的豪斯多夫维数.

英文摘要:

A general form of the Borel-Cantelli Lemma and its connection with the proof of Khintchine's Theorem on Diophantine approximation and the more general Khintchine-Groshev theorem are discussed. The torus geometry in the planar case allows a relatively direct proof of the planar Groshev theorem for the set of $ψ$-approximable points in the plane. The construction and use of Haudsorff measure and dimension are explained and the notion of ubiquity, which is effective in estimating the lower bound of the Hausdorff dimension for quite general lim sup sets, is described. An application is made to obtain the Hausdorff dimension of the set of approximable points in the plane when $ψ(q)=q^{-v}$, $v>0$, corresponding to the planar Jarnik-Besicovich theorem.

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