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Universal approximations of certain functionals in Banach spaces. (English) Zbl 0315.41038
MSC:
41A65 Abstract approximation theory (approximation in normed linear spaces and other abstract spaces)
41A50 Best approximation, Chebyshev systems
46B15 Summability and bases; functional analytic aspects of frames in Banach and Hilbert spaces
65D99 Numerical approximation and computational geometry (primarily algorithms)
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