S. A. Stasyuk
Abstract
We obtain order-sharp estimates of best approximations for the classes B Ω of periodic functions of several variables by trigonometric polynomials whose spectra are generated by the level surfaces of the function Ω(t).
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We obtain order-sharp estimates of best approximations for the classes B Ω of periodic functions of several variables by trigonometric polynomials whose spectra are generated by the level surfaces of the function Ω(t).
Key concepts: Mathematics, Periodic function, Approximations of π, Trigonometric polynomial, Trigonometry, Order (exchange), Trigonometric functions, Function (biology)