Math Symbol for IFFDate: 06/18/2003 at 10:11:48 From: Jim Williams Subject: Mathematical symbol Is there a mathematical symbol for the term "if and only if"? Thank you, Jim Williams Date: 06/18/2003 at 11:58:53 From: Doctor Douglas Subject: Re: Mathematical symbol Hi Jim, thanks for writing to the Math Forum. The symbol <-> (a double-headed arrow) is sometimes used in logic to mean "if and only if." More generally, one often abbreviates "if and only if" as "iff." For example: Show that AB = 0 iff (A=0 or B=0). - Doctor Douglas, The Math Forum http://mathforum.org/dr.math/ |
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