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Jackson’s theorem in the spaces $$L^p(R^k)$$, $$0<p<1$$. (English. Russian original) Zbl 0354.41019
Sov. Math., Dokl. 17(1976), 1069-1073 (1977); translation from Dokl. Akad. Nauk SSSR 229, 554-557 (1976).
##### MSC:
 41A65 Abstract approximation theory (approximation in normed linear spaces and other abstract spaces) 41A50 Best approximation, Chebyshev systems 42A10 Trigonometric approximation