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Widths of some classes of functions of several variables. (English. Russian original) Zbl 0524.41013
Sov. Math., Dokl. 26, 619-622 (1982); translation from Dokl. Akad. Nauk SSSR 267, 314-317 (1982).

##### MSC:
 41A46 Approximation by arbitrary nonlinear expressions; widths and entropy 46E30 Spaces of measurable functions ($$L^p$$-spaces, Orlicz spaces, Köthe function spaces, Lorentz spaces, rearrangement invariant spaces, ideal spaces, etc.) 42A05 Trigonometric polynomials, inequalities, extremal problems