Kolmogorov Widths of an Intersection of Anisotropic Finite-Dimensional Balls in $$l^k_q$$ for $$1\le q \le 2$$

Order estimates for the Kolmogorov $$n$$ -widths of the intersection of any family of balls $$\nu_\alpha B^{\overline{k}}_{\overline{p}_\alpha}$$ in the space $$l_q^k$$ for $$1\le q\le 2$$ and $$n\le k/2$$ are obtained; here $$\overline{p}_\alpha=(p_{\alpha,1}, \dots, p_{\alpha,d})$$ , $$\overline{k}=(k_1, \dots, k_d)$$ , $$k=k_1\dots k_d$$ , and $$B^{\overline{k}}_{\overline{p}_\alpha}$$ is the unit ball with respect to the anisotropic norm determined by the vector $$\overline{p}_\alpha$$ .

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Publication Details

Journal
Mathematical Notes
Published
2025-10-01
DOI
https://doi.org/10.1134/s000143462560499x
Primary Topic
Mathematical Approximation and Integration
Type
article
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article

Kolmogorov Widths of an Intersection of Anisotropic Finite-Dimensional Balls in $$l^k_q$$ for $$1\le q \le 2$$

A. A. Vasil’eva
Mathematical Notes
Mathematical Approximation and Integration
article

Kolmogorov Widths of an Intersection of Anisotropic Finite-Dimensional Balls in $$l^k_q$$ for $$1\le q \le 2$$

A. A. Vasil’eva
article en

Abstract

Order estimates for the Kolmogorov $$n$$ -widths of the intersection of any family of balls $$\nu_\alpha B^{\overline{k}}_{\overline{p}_\alpha}$$ in the space $$l_q^k$$ for $$1\le q\le 2$$ and $$n\le k/2$$ are obtained; here $$\overline{p}_\alpha=(p_{\alpha,1}, \dots, p_{\alpha,d})$$ , $$\overline{k}=(k_1, \dots, k_d)$$ , $$k=k_1\dots k_d$$ , and $$B^{\overline{k}}_{\overline{p}_\alpha}$$ is the unit ball with respect to the anisotropic norm determined by the vector $$\overline{p}_\alpha$$ .

Mathematical NotesVol. 118(3-4)
Lomonosov Moscow State University (RU), Moscow Center For Continuous Mathematical Education (RU)
Openalex Percentile: Top 26%
Mathematical Approximation and Integration
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