{"title":"Local connectedness of boundaries for relatively hyperbolic groups","authors":"Ashani Dasgupta, G. Christopher Hruska","doi":"10.1112/topo.12347","DOIUrl":null,"url":null,"abstract":"<p>Let <span></span><math>\n <semantics>\n <mrow>\n <mo>(</mo>\n <mi>Γ</mi>\n <mo>,</mo>\n <mi>P</mi>\n <mo>)</mo>\n </mrow>\n <annotation>$(\\Gamma,\\mathbb {P})$</annotation>\n </semantics></math> be a relatively hyperbolic group pair that is relatively one ended. Then, the Bowditch boundary of <span></span><math>\n <semantics>\n <mrow>\n <mo>(</mo>\n <mi>Γ</mi>\n <mo>,</mo>\n <mi>P</mi>\n <mo>)</mo>\n </mrow>\n <annotation>$(\\Gamma,\\mathbb {P})$</annotation>\n </semantics></math> is locally connected. Bowditch previously established this conclusion under the additional assumption that all peripheral subgroups are finitely presented, either one or two ended, and contain no infinite torsion subgroups. We remove these restrictions; we make no restriction on the cardinality of <span></span><math>\n <semantics>\n <mi>Γ</mi>\n <annotation>$\\Gamma$</annotation>\n </semantics></math> and no restriction on the peripheral subgroups <span></span><math>\n <semantics>\n <mrow>\n <mi>P</mi>\n <mo>∈</mo>\n <mi>P</mi>\n </mrow>\n <annotation>$P \\in \\mathbb {P}$</annotation>\n </semantics></math>.</p>","PeriodicalId":56114,"journal":{"name":"Journal of Topology","volume":"17 2","pages":""},"PeriodicalIF":0.8000,"publicationDate":"2024-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Topology","FirstCategoryId":"100","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1112/topo.12347","RegionNum":2,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATHEMATICS","Score":null,"Total":0}
引用次数: 0
Abstract
Let be a relatively hyperbolic group pair that is relatively one ended. Then, the Bowditch boundary of is locally connected. Bowditch previously established this conclusion under the additional assumption that all peripheral subgroups are finitely presented, either one or two ended, and contain no infinite torsion subgroups. We remove these restrictions; we make no restriction on the cardinality of and no restriction on the peripheral subgroups .
期刊介绍:
The Journal of Topology publishes papers of high quality and significance in topology, geometry and adjacent areas of mathematics. Interesting, important and often unexpected links connect topology and geometry with many other parts of mathematics, and the editors welcome submissions on exciting new advances concerning such links, as well as those in the core subject areas of the journal.
The Journal of Topology was founded in 2008. It is published quarterly with articles published individually online prior to appearing in a printed issue.