🌐EnglishEnglishEspañolFrançaisItalianoPolskiPortuguêsРусскийالعربية한국어中文日本語EntityQ1361755· pop 13· linked from 22 articlesAlexander horned spheretopological embedding of a 2-dimensional sphere in 3-space whose interior is a 3-ball but whose exterior is not simply connectedWikidata factsImageAlexander horned sphere.pngSources (1)wikidata.orgvia Wikidata · CC0Available in 12 languagesEspañolFrançais日本語РусскийItalianoالعربيةCatalanGreekPolskiConnectionsembeddingEntityAntoine's necklaceEntityCategories1924 introductionsFractalsGeometric topology