Abstract <p> Order estimates for the Kolmogorov <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(n\)</EquationSource> </InlineEquation>-widths of the intersection of any family of balls <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(\nu_\alpha B^{\overline{k}}_{\overline{p}_\alpha}\)</EquationSource> </InlineEquation> in the space <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(l_q^k\)</EquationSource> </InlineEquation> for <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\(1\le q\le 2\)</EquationSource> </InlineEquation> and <InlineEquation ID="IEq7"> <EquationSource Format="TEX">\(n\le k/2\)</EquationSource> </InlineEquation> are obtained; here <InlineEquation ID="IEq8"> <EquationSource Format="TEX">\(\overline{p}_\alpha=(p_{\alpha,1}, \dots, p_{\alpha,d})\)</EquationSource> </InlineEquation>, <InlineEquation ID="IEq9"> <EquationSource Format="TEX">\(\overline{k}=(k_1, \dots, k_d)\)</EquationSource> </InlineEquation>, <InlineEquation ID="IEq10"> <EquationSource Format="TEX">\(k=k_1\dots k_d\)</EquationSource> </InlineEquation>, and <InlineEquation ID="IEq11"> <EquationSource Format="TEX">\(B^{\overline{k}}_{\overline{p}_\alpha}\)</EquationSource> </InlineEquation> is the unit ball with respect to the anisotropic norm determined by the vector <InlineEquation ID="IEq12"> <EquationSource Format="TEX">\(\overline{p}_\alpha\)</EquationSource> </InlineEquation>. </p>

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

  • A. A. Vasil’eva

摘要

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 \(\overline{p}_\alpha\) .