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Translated from Matematicheskie Zametki, Vol. 39, No. 5, pp. 651–664, May, 1986.
The author is grateful to V. P. Shunkov, under whose guidance this paper was written.
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Babenko, A.G. The exact constant in the Jackson inequality in L2 . Mathematical Notes of the Academy of Sciences of the USSR 39, 355–363 (1986). https://doi.org/10.1007/BF01156673
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DOI: https://doi.org/10.1007/BF01156673