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A note on the inverse theorem for a generalised modulus of smoothness. (English) Zbl 1274.42001
Summary: We prove the converse to Jackson’s theorem for a modulus of smoothness of first order generalised by means of an asymmetric operator of generalised translation.
MSC:
42A05 Trigonometric polynomials, inequalities, extremal problems
42A10 Trigonometric approximation
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