Zobrazeno 1 - 10
of 147
pro vyhledávání: '"Cammaroto, Filippo"'
Publikováno v:
Revista Matematica Complutense; Sep2024, Vol. 37 Issue 3, p801-818, 18p
We develop a unified framework for the study of properties involving diagonalizations of dense families in topological spaces. We provide complete classification of these properties. Our classification draws upon a large number of methods and constru
Externí odkaz:
http://arxiv.org/abs/1207.4025
A common generalization for two of the main streams of cardinality inequalities is developed; each stream derives from the famous inequality established by A.V. Arhangel'ski\u{\i} in 1969 for Hausdorff spaces. At the end of one stream is the recent i
Externí odkaz:
http://arxiv.org/abs/1206.6779
This article extends the recent study of the cardinal functions $F_{\theta}$ and $t_{\theta}$ for H-closed Urysohn spaces and the research of I. Bandlov and V.I. Ponomarev on tightness type of absolutes. In particular, basic results are obtained and
Externí odkaz:
http://arxiv.org/abs/1206.6556
The research in this paper is a continuation of the investigation of the cardinality of the $\theta$-closed hull of subsets of spaces. This research obtains new upper bounds of the cardinality of the $\theta$-closed hull of subsets using cardinal fun
Externí odkaz:
http://arxiv.org/abs/1206.6554
In this article, starting with results from a paper by Cammaroto and Ko\v{c}inac in 1993, we prove that $t_{\theta}(X) = t_{\theta}(X_{s}) = t(X_{s}) = F_{\theta}(X) = F_{\theta}(X_{s}) = F(X_{s})$ for every H-closed and Urysohn space and we present
Externí odkaz:
http://arxiv.org/abs/1206.6555
The \theta-closed hull of a set A in a topological space is the smallest set C containing A such that, whenever all $closed$ neighborhoods of a point intersect C, this point is in C. We define a new topological cardinal invariant function, the $\thet
Externí odkaz:
http://arxiv.org/abs/1203.5824
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Publikováno v:
In Topology and its Applications 1 July 2017 225:195-205
Publikováno v:
Electronic Journal of Qualitative Theory of Differential Equations. 2022, p1-12. 12p.