| 单词 | if and only if |
| 释义 | if and only if (iff) Equivalence between two statements. ‘If A then B’ means A is a sufficient condition for B and B is a necessary condition for A. ‘If B then A’ means B is a sufficient condition for A and A is a necessary condition for B. If both these statements are true, ‘A if and only if B’, written ‘A iff B’, means that each of A and B is a necessary and sufficient conditions and sufficient condition for the other; either both are true or both are false. The two statements are thus equivalent. |
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