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Universal simultaneous approximations of the coefficient functionals. (English) Zbl 0362.65009
65D15 Algorithms for approximation of functions
41A30 Approximation by other special function classes
41A65 Abstract approximation theory (approximation in normed linear spaces and other abstract spaces)
46B15 Summability and bases; functional analytic aspects of frames in Banach and Hilbert spaces
42A16 Fourier coefficients, Fourier series of functions with special properties, special Fourier series
42C15 General harmonic expansions, frames
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