Dzhafarov, Ar. S. On best approximation of functions in the spaces \(B\) and \(H\). (English) Zbl 0709.41520 Proc. Steklov Inst. Math. 180, 115-118 (1989). MSC: 41A50 Best approximation, Chebyshev systems 41A63 Multidimensional problems 46E35 Sobolev spaces and other spaces of “smooth” functions, embedding theorems, trace theorems PDFBibTeX XMLCite \textit{Ar. S. Dzhafarov}, Proc. Steklov Inst. Math. 180, 115--118 (1989; Zbl 0709.41520)