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Some sharp inequalities for uniform best approximations of periodic functions. (English. Russian original) Zbl 0303.41028
Sov. Math., Dokl. 15, 335-337 (1974); translation from Dokl. Akad. Nauk SSSR 214, 1245-1246 (1974).
MSC:
41A50 Best approximation, Chebyshev systems
42A75 Classical almost periodic functions, mean periodic functions
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