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Totkov, G. A. Exact values of best onesided approximation by trigonometrical polynomials and splines. (English. Russian original) Zbl 0516.42004 Math. Notes 33, 108-114 (1983); translation from Mat. Zametki 33, No. 2, 215-226 (1983). MSC: 42A10 41A15 41A50 × Cite Format Result Cite Review PDF Full Text: DOI
Andreev, A.; Popov, V. A.; Sendov, B. Jackson-type theorems for best one-sided approximations by trigonometrical polynomials and splines. (English) Zbl 0471.42004 Math. Notes 26, 889-896 (1980). MSC: 42A10 41A15 41A50 26A15 26A42 41A17 × Cite Format Result Cite Review PDF Full Text: DOI
Ivanov, Kamen G. New estimates of errors of quadrature formulae, formulae of numerical differentiation and interpolation. (English) Zbl 0461.41021 Anal. Math. 6, 281-303 (1980). MSC: 41A55 41A05 41A25 65D25 65B05 × Cite Format Result Cite Review PDF Full Text: DOI