On Some Open Problems about P-Spaces, Strongly Quasi Baire Spaces and Choice

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作者
Eleftherios Tachtsis
机构
[1] University of the Aegean,Department of Statistics and Actuarial
来源
Results in Mathematics | 2024年 / 79卷
关键词
Axiom of choice; weak axioms of choice; -space; strongly quasi Baire space; permutation model; Pincus’ transfer theorem; 03E25; 03E35; 54A35; 54E52; 54G10;
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摘要
In set theory without the full power of the axiom of choice (AC\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\textbf{AC}$$\end{document}), we resolve open problems from Keremedis, Olfati and Wajch “On P-spaces and Gδ\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$G_{\delta }$$\end{document}-sets in the absence of the Axiom of Choice” on the deductive strength of statements concerning P-spaces and strongly quasi Baire spaces via positive and independence results. For some of the independence results, we construct three new permutation models of ZFA+¬AC\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\textbf{ZFA}+\lnot \textbf{AC}$$\end{document}, where ZFA\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\textbf{ZFA}$$\end{document} denotes the Zermelo–Fraenkel set theory with atoms. Part of our ZFA\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\textbf{ZFA}$$\end{document}-independence proofs are transferable to ZF\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\textbf{ZF}$$\end{document} (i.e. Zermelo–Fraenkel set theory without AC\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\textbf{AC}$$\end{document}).
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