Multiple Fourier sums and ϕ-strong means of their deviations on the classes of \(\bar \psi \)-differentiable functions of many variables
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We present the results concerning the approximation of \(\bar \psi \)-differentiable functions of many variables by rectangular Fourier sums in uniform and integral metrics and establish estimates for the ϕ-strong means of their deviations in terms of the best approximations.
KeywordsFourier Series Orthogonal Projection Differentiable Function Approximation Theory Trigonometric Series
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