Abstract
The trigonometric Fourier series has played a very significant role in solving problems of science and technology. The concept of non-trigonometric Fourier series such as Haar–Fourier series and Walsh–Fourier series were introduced by Haar [1] and Walsh [2], respectively; Kaczmarz, Steinhaus, and Paley studied some aspects of Walsh system between 1929 and 1931.
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