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JOURNALS // Izvestiya Vysshikh Uchebnykh Zavedenii. Matematika // Archive

Izv. Vyssh. Uchebn. Zaved. Mat., 2021 Number 7, Pages 43–51 (Mi ivm9694)

This article is cited in 2 papers

Inequality of Schwarz type for holomorphic self-maps of a disc with fixed points

O. S. Kudryavtsevaab

a Moscow State University, Moscow Center of Fundamental and Applied Mathematics, GSP-1, 1 Leninskie Gory, Moscow, 119991 Russia
b Volgograd State Technical University, 28 Lenin Ave., Volgograd, 400005 Russia

Abstract: In the class of holomorphic functions that mapping the unit disc into itself and having an inner and two boundary fixed points, the exact set of the values of derivative at zero in terms of the angular derivatives at the boundary fixed points is given. As a corollary in the class of such functions a disc of univalence with center at zero is found.

Keywords: holomorphic mapping, fixed point, angular derivative, Schwarz inequality, domain of univalence.

UDC: 517.54

Received: 27.06.2020
Revised: 26.04.2021
Accepted: 29.06.2021

DOI: 10.26907/0021-3446-2021-7-43-51


 English version:
Russian Mathematics (Izvestiya VUZ. Matematika), 2021, 65:7, 35–42


© Steklov Math. Inst. of RAS, 2025