On the absolute convergence of Fourier series in bounded complete orthonormal systems of functions
Sbornik. Mathematics, Tome 22 (1974) no. 2, pp. 201-216
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The paper is devoted to the absolute convergence of Fourier series of absolutely continuous functions in arbitrary bounded complete orthonormal systems of functions. The results obtained are new even for the classical systems, namely the trigonometric system and the Walsh system. Bibliography: 8 titles.
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S. V. Bochkarev. On the absolute convergence of Fourier series in bounded complete orthonormal systems of functions. Sbornik. Mathematics, Tome 22 (1974) no. 2, pp. 201-216. http://geodesic.mathdoc.fr/item/SM_1974_22_2_a3/

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