单词	iff
释义	iff /ɪf / conjunction Logic & Mathematics If and only if.Let the letter ‘M’ represent this operator, and add to the axioms of classical propositional logic the modal axiom M (p v q) iff Mp v Mq.... The truth conditions for negation are: A is true iff A is not true. Let us say that I could have rendered a proposition false in the weak sense iff I was able to do something such that, if I did it, the proposition would have been falsified (though not necessarily by my act, or by any event caused by my act). Origin 1950s: arbitrary extension of if.
随便看	membraneous membrane potential membrane switch membranogenic membranoid membranology membranophone membranoproliferative membranous membranous dysmenorrhea membranous dysmenorrhoea membranous glomerulonephritis membranously membranule membrification membrilla membrillo membrum virile 'membunce 'memb'unce meme Memel memento memento mori memento vivere

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