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On the relation of the spectral test to isotropic discrepancy and Lq-approximation in Sobolev spaces
Journal of Complexity ( IF 1.8 ) Pub Date : 2021-05-07 , DOI: 10.1016/j.jco.2021.101576
Mathias Sonnleitner , Friedrich Pillichshammer

This paper is a follow-up to the recent paper of Pillichshammer and Sonnleitner (2020) [12]. We show that the isotropic discrepancy of a lattice point set is at most d22(d+1) times its spectral test, thereby correcting the dependence on the dimension d and an inaccuracy in the proof of the upper bound in Theorem 2 of the mentioned paper. The major task is to bound the volume of the neighbourhood of the boundary of a convex set contained in the unit cube. Further, we characterize averages of the distance to a lattice point set in terms of the spectral test. As an application, we infer that the spectral test – and with it the isotropic discrepancy – is crucial for the suitability of the lattice point set for the approximation of Sobolev functions.



中文翻译:

索博列夫空间中谱检验与各向同性差异和Lq-近似的关系

本文是 Pillichshammer 和 Sonnleitner (2020) [12] 近期论文的后续。我们表明格点集的各向同性差异至多是d22(d+1)倍其谱测试,从而纠正对维度d的依赖以及上述论文定理 2 中上界证明的不准确性。主要任务是对包含在单位立方体中的凸集边界的邻域体积进行界定。此外,我们根据光谱测试表征到格点集的距离的平均值。作为一个应用,我们推断光谱测试——以及随之而来的各向同性差异——对于用于近似 Sobolev 函数的格点集的适用性至关重要。

更新日期:2021-05-07
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