{"title":"On resolvability, connectedness and pseudocompactness","authors":"A. E. Lipin","doi":"10.1007/s10474-024-01423-0","DOIUrl":null,"url":null,"abstract":"<div><p>\nWe prove that:\nI. If <i>L</i> is a <span>\\(T_1\\)</span> space, <span>\\(|L|>1\\)</span> and <span>\\(d(L) \\leq \\kappa \\geq \\omega\\)</span>, then\nthere is a submaximal dense subspace <i>X</i> of <span>\\(L^{2^\\kappa}\\)</span> such that <span>\\(|X|=\\Delta(X)=\\kappa\\)</span>. \nII. If <span>\\(\\mathfrak{c}\\leq\\kappa=\\kappa^\\omega<\\lambda\\)</span> and <span>\\(2^\\kappa=2^\\lambda\\)</span>, then there is a Tychonoff pseudocompact globally and locally connected space <i>X</i> such that <span>\\(|X|=\\Delta(X)=\\lambda\\)</span> and <i>X</i> is not <span>\\(\\kappa^+\\)</span>-resolvable. \nIII. If <span>\\(\\omega_1\\leq\\kappa<\\lambda\\)</span> and <span>\\(2^\\kappa=2^\\lambda\\)</span>, then there is a regular space <i>X</i> such that <span>\\(|X|=\\Delta(X)=\\lambda\\)</span>, all continuous real-valued functions on <i>X</i> are constant (so <i>X</i> is connected) and <i>X</i> is not <span>\\(\\kappa^+\\)</span>-resolvable.\n</p></div>","PeriodicalId":50894,"journal":{"name":"Acta Mathematica Hungarica","volume":"172 2","pages":"519 - 528"},"PeriodicalIF":0.6000,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Acta Mathematica Hungarica","FirstCategoryId":"100","ListUrlMain":"https://link.springer.com/article/10.1007/s10474-024-01423-0","RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MATHEMATICS","Score":null,"Total":0}
引用次数: 0
Abstract
We prove that:
I. If L is a \(T_1\) space, \(|L|>1\) and \(d(L) \leq \kappa \geq \omega\), then
there is a submaximal dense subspace X of \(L^{2^\kappa}\) such that \(|X|=\Delta(X)=\kappa\).
II. If \(\mathfrak{c}\leq\kappa=\kappa^\omega<\lambda\) and \(2^\kappa=2^\lambda\), then there is a Tychonoff pseudocompact globally and locally connected space X such that \(|X|=\Delta(X)=\lambda\) and X is not \(\kappa^+\)-resolvable.
III. If \(\omega_1\leq\kappa<\lambda\) and \(2^\kappa=2^\lambda\), then there is a regular space X such that \(|X|=\Delta(X)=\lambda\), all continuous real-valued functions on X are constant (so X is connected) and X is not \(\kappa^+\)-resolvable.
期刊介绍:
Acta Mathematica Hungarica is devoted to publishing research articles of top quality in all areas of pure and applied mathematics as well as in theoretical computer science. The journal is published yearly in three volumes (two issues per volume, in total 6 issues) in both print and electronic formats. Acta Mathematica Hungarica (formerly Acta Mathematica Academiae Scientiarum Hungaricae) was founded in 1950 by the Hungarian Academy of Sciences.