Abstract
Integral estimates of lengths of level lines (lemniscates) of rational functions of a complex variable are obtained. These estimates are related to the problem of separation of compact sets by rational functions and to Zolotarev’s problem.
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E. I. Zolotarev, Complete Collection of Works, 2nd ed. (Izd. AN SSSR, Leningrad, 1932) [in Russian].
A. A. Gonchar, “Estimates of the growth of rational functions and some of their applications.,” Mat. Sb. 72(114)(3), 489–503 (1967) [Sb.Math. 1(1967), 445–456 (1968)].
A. A. Gonchar, “Zolotarev problems connected with rational functions,” Mat. Sb. 78(120)(4), 640–654 (1969) [Sb. Math. 7(1969), 623–635 (1970)].
J. L. Walsh, Interpolation and Approximation by Rational Functions in the Complex Domain (Amer. Math. Soc., Providence, RI, 1960; Inostr. Lit., Moscow, 1961).
V. I. Danchenko, “Existence criterion for estimates of derivatives of rational functions,” Mat. Zametki 78(4), 493–502 (2005) [Math. Notes 78 (4), 456–465 (2005)].
I. I. Privalov, Introduction to the Theory of Functions of a Complex Variable (Nauka, Mascow, 1977) [in Russian].
G. M. Goluzin, Geometric Theory of Functions of a Complex Variable (Nauka, Moscow, 1966) [in Russian].
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Original Russian Text © V. I. Danchenko, 2013, published in Matematicheskie Zametki, 2013, Vol. 94, No. 3, pp. 331–337.
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Danchenko, V.I. Integral estimates of lengths of level lines of rational functions and zolotarev’s problem. Math Notes 94, 314–319 (2013). https://doi.org/10.1134/S0001434613090022
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DOI: https://doi.org/10.1134/S0001434613090022