English

Constructions of Lindel\"{o}f scattered P-spaces

Logic 2021-11-10 v1 General Topology

Abstract

We construct locally Lindel\"of scattered P-spaces (LLSP spaces, in short) with prescribed widths and heights under different set-theoretic assumptions. We prove that there is an LLSP space of width ω1\omega_1 and height ω2\omega_2 and that it is relatively consistent with ZFC that there is an LLSP space of width ω1\omega_1 and height ω3\omega_3. Also, we prove a stepping up theorem that, for every cardinal λω2\lambda \geq \omega_2, permits us to construct from an LLSP space of width ω1\omega_1 and height λ\lambda satisfying certain additional properties an LLSP space of width ω1\omega_1 and height α\alpha for every ordinal α<λ+\alpha < \lambda^+. Then, we obtain as consequences of the above results the following theorems: (1) For every ordinal α<ω3\alpha < \omega_3 there is an LLSP space of width ω1\omega_1 and height α\alpha. (2) It is relatively consistent with ZFC that there is an LLSP space of width ω1\omega_1 and height α\alpha for every ordinal α<ω4\alpha < \omega_4.

Keywords

Cite

@article{arxiv.2111.05038,
  title  = {Constructions of Lindel\"{o}f scattered P-spaces},
  author = {Juan Carlos Martínez and Lajos Soukup},
  journal= {arXiv preprint arXiv:2111.05038},
  year   = {2021}
}

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14 pages