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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 41, No. 5, pp. 641–647, May, 1989.
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Sereda, Y.F. Convergence of fourier series with respect to an orthogonal system of functions. Ukr Math J 41, 554–559 (1989). https://doi.org/10.1007/BF01060542
- Fourier Series
- Orthogonal System