A functional inequality for sine series. (English. Russian original) Zbl 1442.42003
Math. Notes 107, No. 3, 531-533 (2020); translation from Mat. Zametki 107, No. 3, 476-478 (2020).
MSC:
| 42A05 | Trigonometric polynomials, inequalities, extremal problems |
| 42A16 | Fourier coefficients, Fourier series of functions with special properties, special Fourier series |
References:
| [1] | Oganesyan, 1. K A., Mat. Zametki, 103, 4, 576 (2018) · doi:10.4213/mzm11843 |
| [2] | Belov, 2. A S., Izv. Akad. Nauk SSSR Ser Mat., 49, 4, 675 (1985) · Zbl 0587.30003 |
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