Exact Values of Widths of Some Functional Classes in L2 and Minimization of the Constants in Inequalities of Jackson – Stechkin Type by G. A. Yusupov

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SOME INEQUALITIES BETWEEN THE BEST SIMULTANEOUS APPROXIMATION AND MODULUS OF CONTINUITY IN THE WEIGHTED BERGMAN SPACE by Muqim S. Saidusainov

Subjects: “…the best simultaneous approximation, modulus of continuity, upper bound, \(n\)-widths…”
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The Exact Inequalities of Jackson–Stechkin Type and the Width Values for Some Classes of Functions in L₂ Space by M. R. Langarshoev

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ON WIDTHS OF SOME CLASSES OF ANALYTIC FUNCTIONS IN A CIRCLE by Mirgand Sh. Shabozov, Muqim S. Saidusainov

Subjects: “…modulus of smoothness, the best approximation, \(n\)-widths, the best linear method of approximation…”
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On the Approximation of Periodic Functions in L2 and the Values of the Widths of Certain Classes of Functions by K. Tukhliev

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Approximation by finite rank operators with ranges in co by Aref Kamal

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\(\mathcal{K}\)-FUNCTIONALS AND EXACT VALUES OF \(n\)-WIDTHS IN THE BERGMAN SPACE by Mukim S. Saidusaynov

Subjects: “…Bergman space, Best mean-square approximation, \(\mathcal{K}\)-functional, \(n\)-width.…”
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