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The lower bounds estimate of the best approximation with a trigonometric polynomials of a summarized functions of two variables

T. O. Kononovich

Poltava State Pedagogical University

Abstract: The lower bounds estimate of the best approximation in metric $L$ of a summarized functions of two variables under condition of summarability of the functions, conjugated by each and both variables, expressed in terms of Fourier coefficients, is obtained.

MSC: 41A10, 41A50

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