Estimate of the Rate of Convergence of Fourier Sums for Functions from Lebesgue Classes on a Set of Full Measure

Abstract

We obtain an estimate of the rate of convergence on a set of full measure of partial sums of trigonometric Fourier series of functions from Lebesgue classes and construct a counterexample showing the order sharpness of this estimate. We derive a condition for Prinsheim convergence almost everywhere of two-dimensional trigonometric Fourier series of functions from Lebesgue classes in terms of the modulus of continuity.