Home›Browse›open cover🌐EnglishEnglishDeutschEspañolFrançaisItalianoPortuguêsРусский한국어中文日本語EntityQ41509136· pop 12open coverSign in to savecover of a topological space consisting solely of open subsetsAvailable in 11 languagesEspañolDeutsch中文日本語РусскийPortuguêsCatalanCzechUkrainian한국어via Wikidata sitelinks · CC0ConnectionsHTML elementEntitycoverEntity