Abstract
In the present paper, we study the degree of approximation of a continuous function f(x) by the Fejer sum F (α,β)n (f,x) of its Fourier-Jacobi series, and also prove a simple inverse theorem.
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Zhongkai, L. On approximation of continuous functions by the Fejer sum of Fourier-Jacobi series. Approx. Theory & its Appl. 6, 30–41 (1990). https://doi.org/10.1007/BF02836094
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DOI: https://doi.org/10.1007/BF02836094