A note on a~theorem of V.~V.~Andrievskii
Zapiski Nauchnykh Seminarov POMI, Investigations on linear operators and function theory. Part XV, Tome 149 (1986), pp. 177-180

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We prove that an estimate of approximation given by V. V. Andrievskii cannot be improved.
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     author = {N. A. Shirokov},
     title = {A note on a~theorem of {V.~V.~Andrievskii}},
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N. A. Shirokov. A note on a~theorem of V.~V.~Andrievskii. Zapiski Nauchnykh Seminarov POMI, Investigations on linear operators and function theory. Part XV, Tome 149 (1986), pp. 177-180. http://geodesic.mathdoc.fr/item/ZNSL_1986_149_a17/