🌐EnglishEnglishFrançaisItalianoPolskiРусскийالعربيةفارسیहिन्दी한국어日本語EntityQ8475379· pop 12Category:Functional equationsWikimedia categoryAvailable in 12 languagesFrançais日本語РусскийItalianoالعربيةहिन्दीNorwegianNorwegian NynorskPolski