P. P. Korovkin, “An asymptotic property of positive methods of summation of Fourier series and best approximation to functions of class <nobr>$Z_2$</nobr> by linear positive polynomial operators.”, Uspekhi Mat. Nauk, 1958, Volume 13, Issue 6(84),Pages <nobr>99

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Scientific notes and problems

An asymptotic property of positive methods of summation of Fourier series and best approximation to functions of class $Z_2$ by linear positive polynomial operators.

P. P. Korovkin

Received: 11.07.1957