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Summability of multiple trigonometric Fourier series by linear methods

Author: Larry Gogoladze
Keywords: best approximation, quasi-polynomials, modulus of continuity
Annotation:

The paper deals with the problem of estimation of deviations of functions of several variables from linear means of their multiple trigonometric Fourier series. An approach of reducing this problem to the corresponding problem for functions of single variable is developed.



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