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On approximation of a class by another class and extremal subspaces inL 1 N. P. KorneičukA. A. Ligun OriginalPaper Pages: 107 - 119
Deviation of best discrete and uniform polynomial approximants A. Kroó OriginalPaper Pages: 121 - 130
Maximal inequalities, convexity inequality and their duality. I J. Mogyoródi OriginalPaper Pages: 131 - 140
On Fourier series with respect to the Walsh-Kaczmarz system V. A. Skvorcov OriginalPaper Pages: 141 - 150