🌐EnglishEnglishDeutschEspañolFrançaisItalianoNederlandsPolskiPortuguêsالعربية한국어中文日本語EntityQ1072771· pop 16· linked from 55 articlesMöbius inversion formularelation between pairs of arithmetic functionsAvailable in 16 languagesEspañolFrançaisDeutsch中文日本語PortuguêsItalianoالعربيةCatalanEsperantoConnectionsDirichlet convolutionEntitymathematicsEntityCategoriesArithmetic functionsEnumerative combinatoricsOrder theory