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A note on the approximation of conjugate functions in the H p ω space

S. Das, H. Dutta, Degree of approximation of signals in certain Lipschitz classes by the Zweier–Euler product summability method of Fourier series, Math. Methods Appl. Sci., 44(6) (2021), 4881–4887. G ...
JSTOR Daily

Polynomial Approximation of Functions in Sobolev Spaces

Mathematics of Computation, Vol. 34, No. 150 (Apr., 1980), pp. 441-463 (23 pages) Constructive proofs and several generalizations of approximation results of J. H. Bramble and S. R. Hilbert are ...