🌐EnglishEnglishDeutschFrançaisItalianoNederlandsPortuguêsРусский한국어日本語EntityQ1554293· pop 9· linked from 253 articlesSeifert surfacesurface whose boundary is a knot or a linkAvailable in 8 languagesFrançaisDeutsch日本語РусскийNederlandsUkrainian한국어via Wikidata sitelinks · CC0Connectionsknot theoryEntitytorus knotEntityCategoriesGeometric topologyKnot theorySurfaces