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A note on the sharpness of J. L. Walsh’s theorem and its extensions for interpolation in the roots of unity. (English) Zbl 0524.30026

MSC:
30E05 Moment problems and interpolation problems in the complex plane
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[1] A. S. Qvaretta, Jr., A. Sharma and R. S. Varga, Interpolation in the roots of unity: an extension of a theorem of J. L. Walsh,Resultate der Mathematik,3 (1981), 155–191.
[2] J. L. Walsh,Interpolation and Approximation by Rational Functions in the Complex Domain, Amer. Math. Soc. Colloquium Publications Volume XX (Providence, Rhode Island, fifth edition, 1969).
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