Sidorov, S. P. On the order of approximation by linear shape preserving operators of finite rank. (English) Zbl 1085.41508 East J. Approx. 7, No. 1, 1-8 (2001). Cited in 2 Documents MSC: 41A25 Rate of convergence, degree of approximation 41A29 Approximation with constraints PDFBibTeX XMLCite \textit{S. P. Sidorov}, East J. Approx. 7, No. 1, 1--8 (2001; Zbl 1085.41508)