Geodesic
On the order of approximation by Fej\'er sums
Izvestiya. Mathematics , Tome 3 (1969) no. 1, pp. 37-49

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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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     author = {\`E. A. Storozhenko},
     title = {On the order of approximation by {Fej\'er} sums},
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     number = {1},
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     url = {http://geodesic.mathdoc.fr/item/IM2_1969_3_1_a3/}
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È. A. Storozhenko. On the order of approximation by Fej\'er sums. Izvestiya. Mathematics , Tome 3 (1969) no. 1, pp. 37-49. http://geodesic.mathdoc.fr/item/IM2_1969_3_1_a3/