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JOURNALS // Sibirskie Èlektronnye Matematicheskie Izvestiya [Siberian Electronic Mathematical Reports] // Archive

Sib. Èlektron. Mat. Izv., 2023 Volume 20, Issue 2, Pages 1185–1199 (Mi semr1636)

Real, complex and functional analysis

Multivalued quasimöbius property and bounded turning

N. V. Abrosimov, V. V. Aseev

Sobolev Institute of Mathematics, pr. Koptyuga, 4, 630090, Novosibirsk, Russia

Abstract: The class of multivalued mappings with bounded angular distortion (BAD) property in metric spaces can be considered as a multivalued analogгу for quasimöbius mappings. We study the connections between quasimeromorphic self-mappings of $X= \bar{R}^n$ and multivalued mappings $F: X\to 2^X$ with BAD property. The main result of the paper concerns the multivalued mappings $F: D\to 2^{\bar{\mathbf C}}$ with BAD property of a domain $D\subset \bar{\mathbf{C}}$. If the image $F(x)$ of each point $x\in D$ is either a point or a continuum with bounded turning then $F$ is proved to be a single-valued quasimöbius mapping. The crucial point in the proof of this result is the local connectedness of the set $F(X)$ for the multivalued continuous mapping $F: X\to 2^Y$ with BAD property. We obtain sufficient conditions providing $F(X)$ to have local connectedness or bounded turning property in the most general case.

Keywords: multivalued quasimöbius mapping, multivalued hyperinjective mapping, Ptolemaic characteristic of tetrad, generalized angle, bounded angular distortion, local connectedness.

UDC: 517.54

MSC: 30C65, 30L10

Received October 1, 2023, published November 20, 2023

Language: English

DOI: doi.org/10.33048/semi.2023.20.073



© Steklov Math. Inst. of RAS, 2025