🌐فارسیEnglishDeutschEspañolFrançaisItalianoNederlandsPolskiPortuguêsSvenskaTiếng ViệtTürkçeРусскийالعربيةفارسی한국어中文日本語EntityQ948386· pop 31· linked from 35 articlesتابع دیریکلهindicator function of rational numbersAvailable in 31 languagesEspañolFrançaisDeutsch中文日本語РусскийPortuguêsItalianoالعربيةAzerbaijaniConnectionsmathematicsEntityInternational Standard Book NumberEntityCategoriesElementary special functionsReal analysis