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This article is cited in 7 scientific papers (total in 7 papers)
Degree of Discrete Generation of Compact Sets
A. V. Ivanova, E. V. Osipovb a Petrozavodsk State University, Faculty of Mathematics
b M. V. Lomonosov Moscow State University
Abstract:
In the present paper, under the continuum hypothesis, we construct an example of a discretely generated compact set $X$ whose square is not discretely generated. For each compact set $X$, there is an ordinally valued characteristic $\operatorname{idc}(X)$, which is the least number of iterations of the $d$-closure generating, as a result, the closure of any original subset $X$. We prove that if $\chi(X)\le\omega_\alpha$, then $\operatorname{idc}(X)\le\alpha+1$.
Keywords:
discretely generated compact set, compact Hausdorff space, $d$-closure, compact extension, one-point compactification, continuum hypothesis.
Received: 14.03.2007 Revised: 07.04.2009
Citation:
A. V. Ivanov, E. V. Osipov, “Degree of Discrete Generation of Compact Sets”, Mat. Zametki, 87:3 (2010), 396–401; Math. Notes, 87:3 (2010), 367–371
Linking options:
https://www.mathnet.ru/eng/mzm4177https://doi.org/10.4213/mzm4177 https://www.mathnet.ru/eng/mzm/v87/i3/p396
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