Geodesic
Extremum problems for functions with small support
Matematičeskie zametki, Tome 60 (1996) no. 3, pp. 323-332 
N. N. Andreev; S. V. Konyagin; A. Yu. Popov. Extremum problems for functions with small support. Matematičeskie zametki, Tome 60 (1996) no. 3, pp. 323-332. http://geodesic.mathdoc.fr/item/MZM_1996_60_3_a0/
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     author = {N. N. Andreev and S. V. Konyagin and A. Yu. Popov},
     title = {Extremum problems for functions with small support},
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     pages = {323--332},
     year = {1996},
     volume = {60},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1996_60_3_a0/}
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Voir la notice de l'article provenant de la source Math-Net.Ru

In this paper we consider an extremum problem for even periodic functions having small intervals as their supports and subject to restrictions on the sum of the absolute values of their Fourier coefficients.

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