Home›Browse›Tychonoff plank🌐EnglishEnglishDeutschFrançaisPortuguêsРусскийEntityQ250509· pop 6· linked from 11 articlesTychonoff plankSign in to savetopological space that is used in mathematics as a counterexample to several plausible-sounding conjecturesAvailable in 6 languagesFrançaisDeutschРусскийPortuguêsUkrainianvia Wikidata sitelinks · CC0