{"title":"CSC空间的弱伪对话性","authors":"Hector Barrig-Acosta, A. Dow","doi":"10.4064/fm135-1-2022","DOIUrl":null,"url":null,"abstract":"In this paper we prove that in forcing extensions by a poset with finally property K over a model of GCH+ , every compact sequentially compact space is weakly pseudoradial. This improves Theorem 4 in [?dow1996more]. We also prove the following assuming s ≤ א2: (i) if X is compact weakly pseudoradial, then X is pseudoradial if and only if X cannot be mapped onto [0, 1]s; (ii) if X and Y are compact pseudoradial spaces such that X × Y is weakly pseudoradial, then X × Y is pseudoradial. This results add to the wide variety of partial answers to the question by Gerlits and Nagy of whether the product of two compact pseudoradial spaces is pseudoradial.","PeriodicalId":55138,"journal":{"name":"Fundamenta Mathematicae","volume":" ","pages":""},"PeriodicalIF":0.5000,"publicationDate":"2021-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"On the weak pseudoradiality of CSC spaces\",\"authors\":\"Hector Barrig-Acosta, A. Dow\",\"doi\":\"10.4064/fm135-1-2022\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"In this paper we prove that in forcing extensions by a poset with finally property K over a model of GCH+ , every compact sequentially compact space is weakly pseudoradial. This improves Theorem 4 in [?dow1996more]. We also prove the following assuming s ≤ א2: (i) if X is compact weakly pseudoradial, then X is pseudoradial if and only if X cannot be mapped onto [0, 1]s; (ii) if X and Y are compact pseudoradial spaces such that X × Y is weakly pseudoradial, then X × Y is pseudoradial. This results add to the wide variety of partial answers to the question by Gerlits and Nagy of whether the product of two compact pseudoradial spaces is pseudoradial.\",\"PeriodicalId\":55138,\"journal\":{\"name\":\"Fundamenta Mathematicae\",\"volume\":\" \",\"pages\":\"\"},\"PeriodicalIF\":0.5000,\"publicationDate\":\"2021-10-30\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Fundamenta Mathematicae\",\"FirstCategoryId\":\"100\",\"ListUrlMain\":\"https://doi.org/10.4064/fm135-1-2022\",\"RegionNum\":3,\"RegionCategory\":\"数学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"MATHEMATICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Fundamenta Mathematicae","FirstCategoryId":"100","ListUrlMain":"https://doi.org/10.4064/fm135-1-2022","RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MATHEMATICS","Score":null,"Total":0}
In this paper we prove that in forcing extensions by a poset with finally property K over a model of GCH+ , every compact sequentially compact space is weakly pseudoradial. This improves Theorem 4 in [?dow1996more]. We also prove the following assuming s ≤ א2: (i) if X is compact weakly pseudoradial, then X is pseudoradial if and only if X cannot be mapped onto [0, 1]s; (ii) if X and Y are compact pseudoradial spaces such that X × Y is weakly pseudoradial, then X × Y is pseudoradial. This results add to the wide variety of partial answers to the question by Gerlits and Nagy of whether the product of two compact pseudoradial spaces is pseudoradial.
期刊介绍:
FUNDAMENTA MATHEMATICAE concentrates on papers devoted to
Set Theory,
Mathematical Logic and Foundations of Mathematics,
Topology and its Interactions with Algebra,
Dynamical Systems.