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The existence of best approximations of functions by sums of a finite number of plane waves of given directions in the \(L_ p\) metric. (English. Russian original) Zbl 0169.07703

Sov. Math., Dokl. 8, 1288-1291 (1967); translation from Dokl. Akad. Nauk SSSR 176, 1225-1228 (1967).
MSC:  41A50
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