| 1. | if and only if | ||
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A term used by mathematicians and logicians to indicate that something happens under very specific conditions. Often seen in proofs and theories. 1) The sum a geometric sequence is given by a/(1-r) if and only if |r| < 1.
2) In a bar: dumped guy: "My girlfriend left me because I told her I loved her!" other guy: "What a bitch!" dumped guy: "No, it's all my fault, she's a mathematician, and I should have said 'I love you and only you'". |
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