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The (dis)connectedness of products of Hausdorff spaces in the box topology
Linköping University, Department of Mathematics, Algebra, Geometry and Discrete Mathematics. Linköping University, Faculty of Science & Engineering.
2021 (English)In: Commentationes Mathematicae Universitatis Carolinae, ISSN 0010-2628, E-ISSN 1213-7243, Vol. 62, no 4, p. 483-489Article in journal (Refereed) Published
Abstract [en]

In this paper the following two propositions are proved: (a) If X-alpha, alpha is an element of A, is an infinite system of connected spaces such that infinitely many of them are nondegenerated completely Hausdorff topological spaces then the box product square(alpha is an element of A) X-alpha can be decomposed into continuum many disjoint nonempty open subsets, in particular, it is disconnected. (b) If X-alpha, alpha is an element of A, is an infinite system of Brown Hausdorff topological spaces then the box product square X-alpha is an element of (A)alpha is also Brown Hausdorff, and hence, it is connected. A space is Brown if for every pair of its open nonempty subsets there exists a point common to their closures. There are many examples of countable Brown Hausdorff spaces in literature.

Place, publisher, year, edition, pages
CHARLES UNIV, FAC MATHEMATICS & PHYSICS , 2021. Vol. 62, no 4, p. 483-489
Keywords [en]
box topology; connectedness; completely Hausdorff space; Urysohn space; Brown space
National Category
Geometry
Identifiers
URN: urn:nbn:se:liu:diva-187613DOI: 10.14712/1213-7243.2022.001ISI: 000818514600008OAI: oai:DiVA.org:liu-187613DiVA, id: diva2:1691101
Available from: 2022-08-29 Created: 2022-08-29 Last updated: 2022-08-29

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Algebra, Geometry and Discrete MathematicsFaculty of Science & Engineering
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