🌐EnglishEnglishEspañolItalianoPortuguêsРусскийالعربية中文EntityQ5420776· pop 7· linked from 77 articlesexpansionoperation on a polytope where facets are separated and moved radially apart, and new facets are formed at separated elementsAvailable in 7 languagesEspañolРусскийPortuguêsItalianoالعربيةRomanianvia Wikidata sitelinks · CC0ConnectionsfaceEntityHarold Scott MacDonald CoxeterEntityCategoriesEuclidean geometryPolytopes