We show the unimprovability of a theorem on sufficient convergence conditions for the trigonometric Fourier series of a function in classes phi(L) in the case when the class phi( L) is "close" to L.
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页码:S81 / S87
页数:7
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[Anonymous], 1925, Fundam. Math, DOI DOI 10.4064/FM-7-1-24-29
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Bari N.K., 1961, TRIGONOMETRIC SERIES
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