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arXiv 2511.02492math.NTmath.DS
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精确迪ophantine逼近中集合的豪斯多夫测度

Hausdorff measures of sets in Exact Diophantine approximation

School of Mathematics and Statistics, Huazhong University of Science and Technology(华中科技大学数学与统计学院);School of Statistics and Mathematics, Hubei University of Economics(湖北经济学院统计与数学学院);Hubei Center for Data and Analysis(湖北省数据分析中心)

Bo Tan, Chen Tian, Baowei Wang, Jun Wu

AI总结:

本文研究了精确迪ophantine逼近中集合的豪斯多夫测度,提出了新的数学框架并给出了相关条件。

摘要:

设(X,d)为紧致度量空间,Q⊆X为可数集。给定函数R:Q→R^+和ϕ:R^+→R^+,我们考虑集合E(Q,R,ϕ)中的点x∈X,这些点会“击中”逐渐缩小的球B(ξ,ϕ(R(ξ)))无限多次,但对于每个ε∈(0,1),它们最终会被“清除”出稍小的邻域B(ξ,(1-ε)ϕ(R(ξ))),即这些点位于除了有限多个之外的所有更小的球之外。我们给出了E(Q,R,ϕ)具有无限Hausdorff f-测度的充分条件(在 mild 假设下也是必要条件)。这种设定扩展了经典的集合Exact(ψ)(其中ψ非递增)和某些类型的限制迪ophantine逼近集。

英文摘要:

Let $(X, d)$ be a compact metric space, and let $Q \subset X$ be countable. Given functions $R: Q \to \mathbb{R}^+$ and $ϕ: \mathbb{R}^+ \to \mathbb{R}^+$, we consider the set $E(Q, R, ϕ)$ of points $x \in X$ that ``hit'' the shrinking balls $B(ξ,{ϕ(R(ξ))})$ for infinitely many $ξ\in Q$, yet, for every $ε\in (0,1)$, are eventually ``cleared out'' from the slightly smaller neighborhoods $B(ξ,{(1-ε)ϕ(R(ξ))})$, that is, they lie outside all but finitely many of these smaller balls. We give sufficient conditions (also necessary under mild assumptions) for $E(Q, R, ϕ)$ to have infinite Hausdorff $f$-measure. This setting generalizes both the classical set $\mathrm{Exact}(ψ)$ of exactly $ψ$-approximable points (with $ψ$ non-increasing) and certain types of restricted Diophantine approximation sets.

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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