Are math definitions iff statements?

Question

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.

Yes, they are. But usually only "if" is used. – drhab Dec 11 '15 at 15:46 — drhab, Dec 11 '15 at 15:46

score 1 · Accepted Answer · answered Dec 11 '15 at 15:46

1

Yes, any definition is a 'iff' statement, though we use just 'if' in definition.

answered Dec 11 '15 at 15:46

mahbubweb

1 Answers1