Home›Topological spaces›Tychonoff plank🌐EnglishEnglishDeutschFrançaisPortuguêsРусскийEntityQ250509· pop 6· linked from 11 articlesTychonoff planktopological space that is used in mathematics as a counterexample to several plausible-sounding conjecturesAvailable in 6 languagesFrançaisDeutschРусскийPortuguêsUkrainianvia Wikidata sitelinks · CC0Connectionsnormal spaceEntityordinal numberEntityCategoriesTopological spaces