🌐EnglishEnglishDeutschEspañolItalianoNederlandsPortuguêsالعربية한국어中文日本語EntityQ277987· pop 9· linked from 6 articlesTeichmüller–Tukey lemmalemma that states that every nonempty collection of finite character has a maximal element with respect to inclusionConnectionssubsetEntityInternational Standard Book NumberEntityCategoriesAxiom of choiceFamilies of setsLemmas in set theoryOrder theory