🌐EnglishEnglishBahasa IndonesiaDeutschEspañolFrançaisItalianoNederlandsPortuguêsSvenskaTürkçeРусскийالعربيةفارسیहिन्दीไทย한국어中文日本語EntityQ236975· pop 27· linked from 683 articlesclassical logicAlso known as standard logic, Frege–Russell logicclass of formal logicsAvailable in 27 languagesEspañolFrançaisDeutsch中文日本語РусскийPortuguêsItalianoहिन्दीbe_x_oldConnectionssemantic theory of truthEntitymathematical logicEntityCategoriesClassical logicHistory of logicLogic