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

Izv. Vyssh. Uchebn. Zaved. Mat., 2024 Number 2, Pages 81–84 (Mi ivm9956)

Brief communications

On the classification of points of the unit circle for subharmonic functions of class $\mathfrak{A}^*$

S. L. Berberyan

Russian-Armenian (Slavic) State University, 123 Hovsep Emin str., Yerevan, 0051, Republic of Armenia

Abstract: In this article, we consider a class $\mathfrak{A}^*$ consisting of functions, subharmonic in the unit disk and such that their compositions with some families of linear fractional automorphisms of the disk form normal families. We prove a theorem which states that for any function of class $\mathfrak{A}^*$ the set of points of the unit circle can be represented as a union of Fatou points, generalized point Plesner, and a set of zero measure.

Keywords: subharmonic function, limit set, angular limit, class $\mathfrak{A}^*$.

UDC: 517.538

Received: 17.10.2023
Revised: 25.12.2023
Accepted: 26.12.2023

DOI: 10.26907/0021-3446-2024-2-81-84



© Steklov Math. Inst. of RAS, 2025