Abstract
We obtain estimates of approximation numbers of integral operators, with the kernels belonging to Sobolev classes or classes of functions with bounded mixed derivatives. Along with the estimates of approximation numbers, we also obtain estimates of best bilinear approximation of such kernels.
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Communicated by Charles A. Micchelli.
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Temlyakov, V.N. On estimates of approximation numbers and best bilinear approximation. Constr. Approx 8, 23–33 (1992). https://doi.org/10.1007/BF01208903
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DOI: https://doi.org/10.1007/BF01208903