🌐EnglishEnglishBahasa IndonesiaDeutschEspañolFrançaisItalianoNederlandsPolskiPortuguêsSvenskaTiếng ViệtTürkçeРусскийالعربيةفارسیहिन्दीไทย中文日本語EntityQ949972· pop 51· linked from 1,655 articlesif and only iflogical connectiveArticle↔⇔≡⟺Logical symbols representing iffRead full article (88 paragraphs)Gallery (7)ConnectionsdefinitionEntitylogical disjunctionEntityCategoriesLogical connectivesMathematical terminologyNecessity and sufficiency