Geodesic
On the order of approximation by Fejér sums
Izvestiya. Mathematics, Tome 3 (1969) no. 1, pp. 37-49 
È. A. Storozhenko. On the order of approximation by Fejér sums. Izvestiya. Mathematics, Tome 3 (1969) no. 1, pp. 37-49. http://geodesic.mathdoc.fr/item/IM2_1969_3_1_a3/
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Voir la notice de l'article provenant de la source Math-Net.Ru

In this paper we study the degree of approximation almost everywhere by Fejér sums of orthogonal series $\displaystyle\sum^\infty_{k=0}c_k\varphi_k(x)$, where the coefficients $c_k$ satisfy special conditions.

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