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Characterization of certain classes of functions. (English) Zbl 0113.27503


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[1] P. L. BUTZER, Fourier-lransfrm methods in the theory of approximation, Archive for Rational Mechanics and Analysis, 5(1960), 390-415. · Zbl 0107.32101
[2] B. S. NAGY, Sur une classe generale de precedes de sommation pour les series d Fourier, Hungaria Acta Math., 1(1948), 1-39. · Zbl 0034.04401
[3] R. SALEM AND A. ZYGMUND, Capacity of sets and Fourier series, Transaction Amer Math. Soc., 59(1946), 23-41. JSTOR: · Zbl 0060.18511
[4] S. B. SECKIN, On the best approximationof some classes of functions by trigonometri polynomials, Izvestja Akad. Nauk., 20(1956), 643-648 (Russian).
[5] G. SUNOUCHI AND C. WATARI, On determination of the class of saturation in the theor of approximation of functions II, Tohoku Math. Journ., 11(1959), 480-488. · Zbl 0128.29103
[6] M. ZAMANSKY, Classes de saturation de certaines precedes d’approximation des serie de Fourier des functions continues, Ann. Sci. Ecole Normale Sup., 66(1949), 19-93. · Zbl 0034.18702
[7] A. ZYGMUND, On certain methods of summabilily associated with conjugate trigono metric series, Studia Math., 10(1948), 97-105. · Zbl 0038.21901
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