🌐EnglishEnglishDeutschEspañolFrançaisItalianoNederlandsPortuguês日本語EntityQ1640479· pop 11· linked from 25 articlesnegation normal formAlso known as NNFtermAvailable in 11 languagesEspañolFrançaisDeutsch日本語PortuguêsItalianoCatalanNederlandsSerbianUkrainianConnectionspropositional calculusEntityfirst-order logicEntityCategoriesKnowledge compilationNormal forms (logic)Propositional calculus