The Whitney constants are bounded by two
Matematičeskie zametki, Tome 53 (1993) no. 5, pp. 158-160.

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Yu. V. Kryakin. The Whitney constants are bounded by two. Matematičeskie zametki, Tome 53 (1993) no. 5, pp. 158-160. http://geodesic.mathdoc.fr/item/MZM_1993_53_5_a17/

[1] Whitney H., J. Math. Pure et Appl., 36 (1957), 67–95 | MR | Zbl

[2] Sendov B., Popov V., The average moduli of smoothness, J. Wiley Son, 1989

[3] Brudnyi Yu. A., “Konstanty Uitni”, Sovremennye problemy teorii funktsii, Tezisy dokladov Vsesoyuznoi Shkoly-konferentsii (Baku. 19–29 maya 1989 g.), 24

[4] Kryakin Yu. V., “O konstantakh Uitni”, Sovremennye problemy teorii funktsii, Tezisy dokladov Vsesoyuznoi Shkoly-konferentsii (Baku. 19–29 maya 1989 g.), 61–62

[5] Kryakin Yu. V., Matem. zametki, 46:2 (1989), 155–157 | MR | Zbl

[6] Prudnikov A. P., Brychkov Yu. A., Marichev O. I., Integraly i ryady, Nauka, M., 1981 | Zbl