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Universal simultaneous approximations of the coefficient functionals. (English) Zbl 0362.65009
MSC:
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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