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arXiv 2409.00775math.NT
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模1稠密性的例外点

Exceptional Points for Density Modulo 1

Daniel Berend, Michael D. Boshernitzan, Grigori Kolesnik, Rishi Kumar

AI总结:

本文研究实数序列伸缩在模1下不稠密的例外点集,证明其Hausdorff维数和修正盒维数可取0到1之间任意值,并对自然子集及二进制展开约束点集给出维数结果。

摘要:

众所周知,几乎每一个发散到 $\infty$ 的实数序列的伸缩(dilation)在模~1 意义下都是稠密的。本文研究例外点集——即那些伸缩不稠密的点。具体地,我们考虑例外点集的 Hausdorff 维数和修正盒维数。特别地,我们证明该集合的维数可以是 0 到 1 之间的任意数。对于例外点集的两个“自然”子集,也得到了类似的结果。此外,本文计算了若干由二进制展开上的特定约束所定义的点集的维数。

英文摘要:

It is well known that almost every dilation of a sequence of real numbers, that diverges to $\infty$, is dense modulo~1. This paper studies the exceptional set of points -- those for which the dilation is not dense. Specifically, we consider the Hausdorff and modified box dimensions of the set of exceptional points. In particular, we show that the dimension of this set may be any number between 0 and 1. Similar results are obtained for two ``natural'' subsets of the set of exceptional points. Furthermore, the paper calculates the dimension of several sets of points, defined by certain constraints on their binary expansion.

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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