I was wondering if definitions in mathematics are "if and only" statements?
I know for sure that theorems are not "iff" statements.
Thank you in advance for your help.
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$\begingroup$ Yes, they are. But usually only "if" is used. $\endgroup$– drhabDec 11, 2015 at 15:46
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Yes, any definition is a 'iff' statement, though we use just 'if' in definition.
