🌐EnglishEnglishDeutschEspañolFrançaisItalianoNederlandsPortuguêsРусскийالعربيةفارسی한국어中文日本語EntityQ1755512· pop 18· linked from 290 articlesdualitytranslates mathematical concepts into other concepts, in a one-to-one fashionAvailable in 16 languagesEspañolFrançaisDeutsch中文РусскийItalianoالعربيةFinnishGalicianNorwegian NynorskConnectionspartially ordered setEntityfunctorEntityCategoriesDuality (mathematics)