Abstract
We determine the exact value of the upper bound for the deviation of the triharmonic Poisson integral from functions of the Hölder class.
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Zhyhallo, K.M., Kharkevych, Y.I. On the Approximation of Functions of the Hölder Class by Triharmonic Poisson Integrals. Ukrainian Mathematical Journal 53, 1012–1018 (2001). https://doi.org/10.1023/A:1013364321249
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DOI: https://doi.org/10.1023/A:1013364321249