🌐EnglishEnglishDeutschEspañolFrançaisItalianoPolskiPortuguêsРусскийالعربيةไทย한국어中文日本語EntityQ780239· pop 17· linked from 135 articlesmulti-index notationmathematical notationAvailable in 17 languagesEspañolFrançaisDeutsch中文日本語РусскийPortuguêsItalianoالعربيةBulgarianCatalanConnectionsdifferential formEntitynatural numberEntityCategoriesCombinatoricsMathematical notation