Boyanov, T. P. Is \(\omega(f,\delta)=o(\delta)\) a sufficient condition for \(f=\text{const}\)? (English) Zbl 0852.26005 C. R. Acad. Bulg. Sci. 47, No. 5, 9-11 (1994). Reviewer: E.Alsynbaeva (Alma-Ata) MSC: 26A15 54C05 54C30 PDFBibTeX XMLCite \textit{T. P. Boyanov}, C. R. Acad. Bulg. Sci. 47, No. 5, 9--11 (1994; Zbl 0852.26005)
Nikoltjeva-Hedberg, M.; Andreev, A. S. Estimate of the error in Adam’s method for solving second order ordinary differential equations. (English) Zbl 0674.65045 C. R. Acad. Bulg. Sci. 42, No. 4, 15-18 (1989). Reviewer: E.Schechter MSC: 65L05 26A15 41A25 34A34 PDFBibTeX XMLCite \textit{M. Nikoltjeva-Hedberg} and \textit{A. S. Andreev}, C. R. Acad. Bulg. Sci. 42, No. 4, 15--18 (1989; Zbl 0674.65045)
Khristov, V. Kh. Connection between classical and averaged modules of smoothness of functions of several variables. (Russian) Zbl 0593.41030 C. R. Acad. Bulg. Sci. 38, 175-178 (1985). Reviewer: J.Siciak MSC: 41A50 41A63 26A15 PDFBibTeX XMLCite \textit{V. Kh. Khristov}, C. R. Acad. Bulg. Sci. 38, 175--178 (1985; Zbl 0593.41030)
Kowalski, I. K. Averaged modulus in Banach spaces. (English) Zbl 0559.46006 C. R. Acad. Bulg. Sci. 37, 423-426 (1984). MSC: 46B15 26A42 26A15 PDFBibTeX XMLCite \textit{I. K. Kowalski}, C. R. Acad. Bulg. Sci. 37, 423--426 (1984; Zbl 0559.46006)
Khristov, V. Kh. On the quantitative Korovkin theorem in \(L_ p\) for periodic functions. (Russian) Zbl 0525.41023 C. R. Acad. Bulg. Sci. 36, 1035-1038 (1983). MSC: 41A36 41A17 26A15 42A75 PDFBibTeX XMLCite \textit{V. Kh. Khristov}, C. R. Acad. Bulg. Sci. 36, 1035--1038 (1983; Zbl 0525.41023)
Ivanov, K. G. Some characterizations of the best algebraic approximation in \(L^ p[- 1,1]\) (\(1 \leq p \leq \infty\)). (English) Zbl 0488.41025 C. R. Acad. Bulg. Sci. 34, 1229-1232 (1981). MSC: 41A50 41A25 41A10 26A15 41A35 PDFBibTeX XMLCite \textit{K. G. Ivanov}, C. R. Acad. Bulg. Sci. 34, 1229--1232 (1981; Zbl 0488.41025)
Totkov, G. A.; Bazelkov, M. S. Über eine optimale Polygonalinterpolation von Funktionen zweier Veränderlichen. (Russian) Zbl 0468.41003 C. R. Acad. Bulg. Sci. 33, 603-605 (1980). MSC: 41A05 41A30 41A63 26A15 PDFBibTeX XMLCite \textit{G. A. Totkov} and \textit{M. S. Bazelkov}, C. R. Acad. Bulg. Sci. 33, 603--605 (1980; Zbl 0468.41003)
Ivanov, K. G. Direct and converse theorems for the best algebraic approximation in \(C[- 1,1]\) and \(L_p[-1,1]\). (English) Zbl 0458.41020 C. R. Acad. Bulg. Sci. 33, 1309-1312 (1980). MSC: 41A50 26A15 PDFBibTeX XMLCite \textit{K. G. Ivanov}, C. R. Acad. Bulg. Sci. 33, 1309--1312 (1980; Zbl 0458.41020)
Popov, V. A. Eine Bemerkung über die einseitige Approximation von Funktionen. (Russian) Zbl 0439.41007 C. R. Acad. Bulg. Sci. 32, 1319-1322 (1979). MSC: 41A10 41A50 26A15 42A10 PDFBibTeX XMLCite \textit{V. A. Popov}, C. R. Acad. Bulg. Sci. 32, 1319--1322 (1979; Zbl 0439.41007)