Golubov B. I.

Korneichuk N.

M. Skopina

P. Andrianov

Sz.-Nagy B.

Timan A. F.

 Uniform approximation of multivariate periodic functions by Haar polynomials is studied. A general sharp Jackson type inequality and its refinement for certain types of numbers [Formula: see text] are discussed. An interesting phenomenon appears for some numbers [Formula: see text]: a sharp estimate is not unique. </jats:p

On Jackson-type inequalities associated with separable Haar wavelets

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