Dem’yanovich, Yu. K. Über eine bewichtete Abschätzung der besten Approximationen im \(L_2(\Omega)\). (Russian) Zbl 0431.41039 Mat. Zametki 22, 245-255 (1977). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 1 Review MSC: 41A65 Abstract approximation theory (approximation in normed linear spaces and other abstract spaces) 41A50 Best approximation, Chebyshev systems Keywords:existence of the best approximation PDF BibTeX XML Cite \textit{Yu. K. Dem'yanovich}, Mat. Zametki 22, 245--255 (1977; Zbl 0431.41039)