🌐EnglishEnglishBahasa IndonesiaItalianoPortuguêsSvenskaTürkçeالعربيةفارسی中文EntityQ830486· pop 10· linked from 313 articlesopen formulaformula that contains at least one free variableAvailable in 10 languages中文PortuguêsItalianoالعربيةBahasa IndonesiaHungarianSvenskaTürkçeفارسیvia Wikidata sitelinks · CC0Connectionsfirst-order logicEntitysemantic theory of truthEntityCategoriesLogical expressions