{"title":"Lipschitz-free spaces and approximating sequences of projections","authors":"Gilles Godefroy","doi":"10.1007/s43037-024-00332-2","DOIUrl":null,"url":null,"abstract":"<p>The Lipschitz-free space <span>\\({\\mathcal {F}}(M)\\)</span> has an F.D.D. when <i>M</i> is a separable <span>\\({\\mathcal {L}}_1\\)</span>-Banach space, or when <span>\\(M\\subset {\\mathbb {R}}^n\\)</span> is a somewhat regular subset. The interplay between the existence of extension operators for Lipschitz maps and the <span>\\((\\pi )\\)</span>-property in Lipschitz-free spaces is investigated. If <i>M</i> is an arbitrary metric space, then <span>\\({\\mathcal {F}}(M)\\)</span> has the <span>\\((\\pi )\\)</span>-property up to a universal logarithmic factor. It follows in particular that the <span>\\((\\pi )\\)</span>-property up to a logarithmic factor fails to imply the approximation property. A list of commented open problems is provided.</p>","PeriodicalId":1,"journal":{"name":"Accounts of Chemical Research","volume":null,"pages":null},"PeriodicalIF":16.4000,"publicationDate":"2024-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Accounts of Chemical Research","FirstCategoryId":"100","ListUrlMain":"https://doi.org/10.1007/s43037-024-00332-2","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
The Lipschitz-free space \({\mathcal {F}}(M)\) has an F.D.D. when M is a separable \({\mathcal {L}}_1\)-Banach space, or when \(M\subset {\mathbb {R}}^n\) is a somewhat regular subset. The interplay between the existence of extension operators for Lipschitz maps and the \((\pi )\)-property in Lipschitz-free spaces is investigated. If M is an arbitrary metric space, then \({\mathcal {F}}(M)\) has the \((\pi )\)-property up to a universal logarithmic factor. It follows in particular that the \((\pi )\)-property up to a logarithmic factor fails to imply the approximation property. A list of commented open problems is provided.
期刊介绍:
Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance.
Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.