English

Weak normality properties in $\Psi$-spaces

General Topology 2020-07-14 v1

Abstract

Almost disjoint families of true cardinality c\mathfrak{c} are used to produce an example of a mildly-normal not partly-normal Ψ\Psi-space and a quasi-normal not almost-normal Ψ\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 Ψ\Psi-space is quasi-normal is provided.

Keywords

Cite

@article{arxiv.2007.05844,
  title  = {Weak normality properties in $\Psi$-spaces},
  author = {Sergio A and Garcia-Balan and Paul J. Szeptycki},
  journal= {arXiv preprint arXiv:2007.05844},
  year   = {2020}
}

Comments

13 pages

R2 v1 2026-06-23T17:02:48.781Z