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Ismagilov Type Theorems for Linear, Gel′fand and Bernstein n-Widths
Authors:Osipenko K. Yu.  Parfenov O. G.
Abstract:Using a variational principle for s-numbers, we obtain estimates for the linear, Gel′fand. and Bernstein n-widths. A simple proof of some results concerned with the exact values of n-widths of diagonal operators is given. We also calculate the exact values at the Bernstein n-widths for the Hardy-Sobolev classes.
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