We determine the exact values of upper bounds of approximations by biharmonic Poisson integrals on classes of conjugate differentiable functions in uniform and integral metrics.
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Translated from Ukrains’kyi Matematychnyi Zhurnal, Vol. 61, No. 3, pp. 333–345, March, 2009.
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Zhyhallo, K.M., Kharkevych, Y.I. Approximation of conjugate differentiable functions by biharmonic Poisson integrals. Ukr Math J 61, 399–413 (2009). https://doi.org/10.1007/s11253-009-0217-x
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DOI: https://doi.org/10.1007/s11253-009-0217-x