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JOURNALS // Itogi Nauki i Tekhniki. Sovremennaya Matematika i ee Prilozheniya. Tematicheskie Obzory // Archive

Itogi Nauki i Tekhniki. Sovrem. Mat. Pril. Temat. Obz., 2018 Volume 144, Pages 96–103 (Mi into277)

This article is cited in 7 papers

Categorical and Cardinal Properties of Hyperspaces with a Finite Number of Components

R. B. Beshimova, N. K. Mamadalievb, Sh. Kh. Eshtemirovaa

a National University of Uzbekistan named after M. Ulugbek, Tashkent
b V. I. Romanovskiy Institute of Mathematcs of the Academy of Sciences of Uzbekistan

Abstract: In this paper, we examine categorical and cardinal properties of hyperspaces with finite number of components. We prove that the functor $C_{n}:\operatorname{Comp} \to \operatorname{Comp}$ is not normal, i.e., it does not preserve epimorphisms of continuous mappings. We also discuss the density, the caliber, and the Shanin number of the space $C_{n}(X)$.

Keywords: category, functor, hyperspace, connected component, density, caliber.

UDC: 517.12

MSC: Primary 18B20; Secondary 18A05, 46A63, 46E27, 54A25


 English version:
Journal of Mathematical Sciences (New York), 2020, 245:3, 390–397

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© Steklov Math. Inst. of RAS, 2024