Geodesic
Approximation of periodic functions by Fej\'er suns
Izvestiya. Mathematics , Tome 5 (1971) no. 1, pp. 86-96

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In this work we give an expression for the principal term of deviation of periodic functions belonging to the space $L_p$, $1\leqslant p\leqslant\infty$, from their Fejér sums. 
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     author = {G. K. Lebed' and A. A. Avdeenko},
     title = {Approximation of periodic functions by {Fej\'er} suns},
     journal = {Izvestiya. Mathematics },
     pages = {86--96},
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     volume = {5},
     number = {1},
     year = {1971},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1971_5_1_a6/}
}
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G. K. Lebed'; A. A. Avdeenko. Approximation of periodic functions by Fej\'er suns. Izvestiya. Mathematics , Tome 5 (1971) no. 1, pp. 86-96. http://geodesic.mathdoc.fr/item/IM2_1971_5_1_a6/