What does iff stand for in math

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MathWorld Book. Wolfram Web Resources ». Created, developed, and nurtured by Eric Weisstein at Wolfram Research. Wolfram Alpha » Explore anything with the first computational knowledge engine. This sounds weird to us now, because it goes against the accepted convention, but I can see what Moore was thinking. The statement "A only if B" sounds like the statement "A if B", except that you are also given an extra piece of information: not just A if B, but A only if B.

Add a comment. Active Oldest Votes. So I can conclude it as 'only if' is same as implies and 'iff' is same as equivalence? What comes before the "only if" is the antecedent. For clarification, see "2. A only if B" in the link to which you via Devasish refer. Show 6 more comments. Michael Hardy Michael Hardy 1. One statement is unidirectional, the other is bidirectional.

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