Weak normality properties in $\Psi$-spaces
Almost disjoint families of true cardinality $\mathfrak{c}$ are used to produce an example of a mildly-normal not partly-normal $\Psi$-space and a quasi-normal not almost-normal $\Psi$-space. This is related with a problem posed by Lufti Kalantan where he asks whether there exists a mad family so th...
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Zusammenfassung: | Almost disjoint families of true cardinality $\mathfrak{c}$ are used to
produce an example of a mildly-normal not partly-normal $\Psi$-space and a
quasi-normal not almost-normal $\Psi$-space. This is related with a problem
posed by Lufti Kalantan where he asks whether there exists a mad family so that
the related Mr\'owka-Isbell space is partly-normal. In addition, a consistent
example of a Luzin mad family such that its associated $\Psi$-space is
quasi-normal is provided. |
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DOI: | 10.48550/arxiv.2007.05844 |