🌐EnglishEnglishDeutschEspañolFrançaisItalianoNederlandsPolskiPortuguêsSvenskaРусскийالعربية한국어中文日本語EntityQ936155· pop 21· linked from 56 articlesLindelöf spacetopological space such that every open cover has a countable subcoverAvailable in 21 languagesEspañolFrançaisDeutsch中文日本語РусскийPortuguêsItalianoالعربيةCatalanCzechConnectionscoverEntitycompact spaceEntityCategoriesCompactness (mathematics)General topologyProperties of topological spaces