Kolushov, A. V. On differentiability of the operator of best approximation by rational fractions. (English. Russian original) Zbl 0517.41030 Sov. Math., Dokl. 25, 802-805 (1982); translation from Dokl. Akad. Nauk SSSR 264, 1060-1062 (1982). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 3 Documents MSC: 41A65 Abstract approximation theory (approximation in normed linear spaces and other abstract spaces) 41A50 Best approximation, Chebyshev systems 46G05 Derivatives of functions in infinite-dimensional spaces 58C20 Differentiation theory (Gateaux, FrĂ©chet, etc.) on manifolds Keywords:algebraic polynomials; metric projection PDF BibTeX XML Cite \textit{A. V. Kolushov}, Sov. Math., Dokl. 25, 802--805 (1982; Zbl 0517.41030); translation from Dokl. Akad. Nauk SSSR 264, 1060--1062 (1982)