The problem of V. N. Dubinin for symmetric multiconnected domains

Abstract

UDC 517.54
We consider a quite general problem from the geometric theory of functions on finding a maximal value of the product of the inner radii of $n$ non-overlapping domains, which contain points of the unit circle and are symmetric with respect to the unit circle, and the $\gamma$-powered inner radius of a domain containing the origin.
In this paper, we solve this problem for $n\geq 20$ and $1<\gamma\leq n^{\frac{2}{3}-q(n)}.$

References

M. A. Lavrent`ev, K teorii konformny`kh otobrazhenij, Tr. Fiz.-mat. in-ta AN SSSR., 5, 159 – 245 (1934).

Goluzin, G. M., Geometrical theory of functions of a complex variable (Russian), Moscow, Nauka (1966).

G. V. Kuz`mina, K zadache o maksimume proizvedeniya konformny`kh radiusov nenalegayushhikh oblastej, Zap. nauchn. sem. LOMI, 131 – 145 (1980).

P. M. Tamrazov, E`kstremal`ny`e konformny`e otobrazheniya i polyusy` kvadratichny`kh differenczialov, Izv. AN SSSR, ser. mat., 32, № 5, 1033 – 1043 (1968).

V. N. Dubinin, Metod simmetrizaczii v geometricheskoj teorii funkczij kompleksnogo peremennoyu, Uspekhi mat. nauk, 49, № 1(295), 3 – 76 (1994).

V. N. Dubinin, Razdelyayushhee preobrazovanie oblastej i zadachi ob e`kstremal`nom razbienii, Zap. nauch. sem. Leningr. otd-niya Mat. in-ta AN SSSR, 168, 48 – 66 (1988).

A. K. Bakhtin, G. P. Bakhtina, Yu. B. Zelinskij, Topologo-algebraicheskie struktury` i geometricheskie metody` v kompleksnom analize, Praczi In-tu matematiki NAN Ukrayini, 73, (2008).

Dzh. A. Dzhenkins, Odnolistny`e funkczii i konformny`e otobrazheniya, Izd-vo inostr. lit., Moskva(1962).

G. P. Bakhtina, O konformny`kh radiusakh simmetrichny`kh nenalegayushhikh oblastej, Sovremenny`e voprosy` veshhestvennogo i kompleksnogo analiza, 149, 21 – 27 (1984).

L. V. Kovalev, O vnutrennikh radiusakh simmetrichny`kh nenalegayushhikh oblastej, Izv. vuzov. Matematika, 6, 80 – 81 (2000).

L. V. Kovalev, O trekh neperesekayushhikhsya oblastyakh, Dal`nevost. mat. zhurn., 1, № 1, 3 – 7 (2000).

Ya. V. Zabolotny`j, L. V. Vy`govskaya, O proizvedenii vnutrennikh radiusov simmetrichny`kh mnogosvyazny`kh oblastej, Ukr. mat. visn., 14, № 3, 440 – 451 (2017).

A. K. Bakhtin, L. V. Vy`govskaya, I. V. Denega, Neravenstva dlya vnutrennikh radiusov simmetrichny`kh nenalegayushhikh oblastej, Ukr. mat. visn., 70, № 9, 1282 – 1288 (2018).

Published
20.11.2020
How to Cite
Zabolotnii Y. V. “The Problem of V. N. Dubinin for Symmetric Multiconnected Domains”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 72, no. 11, Nov. 2020, pp. 1502-9, doi:10.37863/umzh.v72i11.6064.
Section
Research articles