Home›Basic concepts in set theory›index set🌐EnglishEnglishBahasa IndonesiaDeutschFrançaisNederlandsPolskiPortuguêsTiếng ViệtTürkçeРусскийالعربية中文日本語EntityQ21285678· pop 13· linked from 84 articlesindex setSign in to savemathematical termAvailable in 13 languagesDeutsch中文日本語РусскийBahasa IndonesiaCroatianGalicianNederlandsNorwegianPolskiTiếng ViệtUkrainianvia Wikidata sitelinks · CC0Connectionsindexed familyEntitymathematicsEntityInternational Standard Book NumberEntitynatural numberEntitysetEntitycryptographyEntitysurjective functionEntitycountable setEntitycomputational complexity theoryEntityindicator functionEntityuncountable setEntityenumerationEntityJames MunkresEntityCategoriesBasic concepts in set theoryMathematical notation