Summary Of: If and only if

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IFF | logic | mathematics | philosophy | biconditional | logical connective | biconditional | material conditional | necessary and sufficient | material implication | citation needed | logic formulae | truth table | XNOR gate | mathematical logic | first-order logic | propositional logic | metalogic | logical connective | exclusive nor | logical systems | proves | inverse | disjunction | truth-functional | John L. Kelley | mathematician | Paul Halmos | biconditional | logical equivalence | uses | mentions | use-mention distinction | W. V. Quine | definitions | universally quantified | group | & | exclusive disjunction | mathematical | necessary and sufficient | mathematical jargon | domain of discourse | ISBN 9780387901251 | | Thinking portal | Logical equality | Logical biconditional | Necessary and sufficient condition | Categories | Logic | Mathematical terminology | Binary operations | All articles with unsourced statements | Articles with unsourced statements from April 2009 |