🌐EnglishEnglishBahasa IndonesiaDeutschEspañolFrançaisItalianoNederlandsPolskiPortuguêsSvenskaTürkçeРусский한국어中文日本語EntityQ856215· pop 24· linked from 101 articlesindexed familyAlso known as indexed set, familycollection of objects, each associated with an index from some index setAvailable in 24 languagesEspañolFrançaisDeutsch日本語РусскийPortuguêsItalianoBahasa IndonesiaBasqueCatalanChuvashConnectionsnatural numberEntityinjectionEntityCategoriesBasic concepts in set theoryMathematical notation