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arXiv 1809.01013math.NTmath-phmath.MPmath.SP
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单边丢番图逼近

One-sided Diophantine approximations

Jaroslav Hančl, Ondřej Turek

摘要:

本文研究$\ell$类($\ell\in\mathbb{N}$)的最佳单侧(下或上)丢番图逼近.我们使用普通的连分数展开式来构造分数$\frac{p}{q}\in\mathbb{Q}$是给定$α\in\mathbb{R}$的$\ell$ -th类的最佳下或上丢番图逼近的显式判据。最好的上下近似集的基数和度量性质进行检查。应用我们的结果在谱分析中,我们得到了一个解释的稀有性,所谓的Bethe-Sommerfeld量子图。

英文摘要:

The paper deals with best one--sided (lower or upper) Diophantine approximations of the $\ell$-th kind ($\ell\in\mathbb{N}$). We use the ordinary continued fraction expansions to formulate explicit criteria for a fraction $\frac{p}{q}\in\mathbb{Q}$ to be a best lower or upper Diophantine approximation of the $\ell$-th kind to a given $α\in\mathbb{R}$. The sets of best lower and upper approximations are examined in terms of their cardinalities and metric properties. Applying our results in spectral analysis, we obtain an explanation for the rarity of so-called Bethe--Sommerfeld quantum graphs.

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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