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Translated from Matematicheskie Zametki, Vol. 41, No. 5, pp. 654–672, May, 1987.
The author thanks S. B. Stechkin for posing the problem and constant interest in the work.
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Kolushov, A.V. Differential properties of the operator of best approximation of continuous functions by rational fractions. Mathematical Notes of the Academy of Sciences of the USSR 41, 366–377 (1987). https://doi.org/10.1007/BF01159860
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DOI: https://doi.org/10.1007/BF01159860