🌐EnglishEnglishBahasa IndonesiaDeutschEspañolFrançaisItalianoPortuguêsРусскийالعربيةفارسی한국어中文日本語EntityQ1378301· pop 15· linked from 375 articlesuniversal setin set theory, a set which contains all objects, including itselfAvailable in 15 languagesEspañolРусскийItalianoالعربيةBahasa Indonesiabe_x_oldBelarusianIcelandicKalmykMalayConnectionssemantic theory of truthEntitymathematical logicEntityCategoriesBasic concepts in set theoryFamilies of setsParadoxes of naive set theorySelf-referenceSystems of set theoryWellfoundedness