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Fourier Series with Respect to General Orthogonal Systems
von A. Olevskii, aus dem Russischen übersetzt von B.P. Marshall und H.J. ChristoffersThe fundamental problem of the theory of Fourier series consists of the investigation of the connections between the metric properties of the function expanded, the behavior of its Fourier coefficients {cn} with respect to an ortho normal system of functions {
