A note on resolvability
A topological space is said to be resolvable if it has two disjoint dense subsets. If ℵ is a cardinal number(finite or infinite), a topological space is said to be ℵ -resolvable if it has a paiwise disjoint family of ℵ many dense subsets. Illanes [ 3 ] showed that a topological space which is κ -res...
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Veröffentlicht in: | Acta mathematica Hungarica 2019-12, Vol.159 (2), p.669-673 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | A topological space is said to be resolvable if it has two disjoint dense subsets. If
ℵ
is a cardinal number(finite or infinite), a topological space is said to be
ℵ
-resolvable if it has a paiwise disjoint family of
ℵ
many dense subsets. Illanes [
3
] showed that a topological space which is
κ
-resolvable for every finite integer
κ
is necessarily
ℵ
0
-resolvable. We generalize this result to infinite cardinals. We show that if a topological space
X
is
κ
-resolvable for every
κ
<
ℵ
and if cofinality of
ℵ
is
ℵ
0
, then,
X
is
ℵ
-resolvable. |
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ISSN: | 0236-5294 1588-2632 |
DOI: | 10.1007/s10474-019-00927-4 |