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Izvestiya Vysshikh Uchebnykh Zavedenii. Matematika, 2020, Number 11, Pages 65–80
DOI: https://doi.org/10.26907/0021-3446-2020-11-65-80
(Mi ivm9626)
 

This article is cited in 1 scientific paper (total in 1 paper)

To question on some generalizations of properties of cohesion of families of sets and supercompactness of topological spaces

A. G. Chentsovab

a N.N. Krasovskii Institute of Mathematics and Mechanics, Ural Branch of the Russian Academy of Sciences, 16 S. Kovalevskoi str., Yekaterinburg, 620108 Russia
b Ural Federal University, 19 Mira str., Yekaterinburg, 620002 Russia
Full-text PDF (448 kB) Citations (1)
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Abstract: Natural generalizations of the cohesion of families (of sets) and supercompactness of topological spaces are considered. In the first case, “multiple” adhesion is analyzed, when the nonemptyness of intersection of sets from subfamilies with cardinality not more than given natural number $\mathbf{n}$ is postulated, and, in the second case, it is postulated the existence of the (open) subbasis for which any covering has a subcovering with cardinality not more than $\mathbf{n}$. The maximal $\mathbf{n}$-linked (in the above-mentioned sense) subfamilies of a $\pi$-system with “zero” and “unit” are investigated; these subfamilies are called maximal $\mathbf{n}$-linked systems or (briefly) $\mathbf{n}$-MLS. Relations between $\mathbf{n}$-MLS and ultrafilters (u/f) of a $\pi$-system are investigated including “dynamics” under variation of $\mathbf{n}$. Moreover, bitopological spaces (BTS) with elements in the form of $\mathbf{n}$-MLS and u/f are investigated; as topologies used under construction of BTS (this is a nonempty set with pair of comparable topologies), in both cases, topologies of Wallman type and Stone type apply. In addition, topology of Wallman type on the set of $\mathbf{n}$-MLS realizes a $\mathbf{n}$-supercompact (in the above-mentioned sense) $T_1$-space; this space is analog of superextension of $T_1$-space. It is demonstrated that BTS of u/f of the initial $\pi$-system is a subspace of BTS with points in the form of $\mathbf{n}$-MLS: the corresponding “Wallman” and “Stone” topologies on the u/f set are induced by the corresponding topologies on the set of $\mathbf{n}$-MLS.
Keywords: bitopological space, linked system, ultrafilters.
Funding agency Grant number
Russian Foundation for Basic Research 19-01-000573_а
Received: 04.12.2019
Revised: 04.12.2019
Accepted: 29.06.2020
English version:
Russian Mathematics (Izvestiya VUZ. Matematika), 2020, Volume 64, Issue 11, Pages 58–72
DOI: https://doi.org/10.3103/S1066369X20110055
Bibliographic databases:
Document Type: Article
UDC: 519.6
Language: Russian
Citation: A. G. Chentsov, “To question on some generalizations of properties of cohesion of families of sets and supercompactness of topological spaces”, Izv. Vyssh. Uchebn. Zaved. Mat., 2020, no. 11, 65–80; Russian Math. (Iz. VUZ), 64:11 (2020), 58–72
Citation in format AMSBIB
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\paper To question on some generalizations of properties of cohesion of families of sets and supercompactness of topological spaces
\jour Izv. Vyssh. Uchebn. Zaved. Mat.
\yr 2020
\issue 11
\pages 65--80
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\jour Russian Math. (Iz. VUZ)
\yr 2020
\vol 64
\issue 11
\pages 58--72
\crossref{https://doi.org/10.3103/S1066369X20110055}
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  • This publication is cited in the following 1 articles:
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    Известия высших учебных заведений. Математика Russian Mathematics (Izvestiya VUZ. Matematika)
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