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A Jackson-type estimation on the real line by interpolation

✍ Scribed by F. Pintér


Publisher
Akadmiai Kiad
Year
1987
Tongue
English
Weight
349 KB
Volume
49
Category
Article
ISSN
1588-2632

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On the Sharpness of a Jackson Estimate b
✍ L. Imhof 📂 Article 📅 1996 🏛 Elsevier Science 🌐 English ⚖ 412 KB

Using ideas of Gru nwald, Marcinkiewicz, and Ve rtesi concerning the divergence of interpolation processes, a counterexample is constructed which establishes that a Jackson estimate for the best approximation by algebraic polynomials given by Ditzian and Totik is sharp in a pointwise sense everywher