if and only if

See: IFF

IFF	Everything logic symbols	How to determine whether a number is divisible by 3	If
omega-null	iffy	tautology	Logical Pickup Lines
Law of Syllogism	Material Implication	Slashdot	proof of Diophantus' theorem on Pythagorean triples
proof	Please stop thanking me for cooling your writeup	subfield	subring
Converse	desda	mathematics	Korselt's criterion for Carmichael numbers
Meno's Paradox	spelling	X	statement

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