implies (=> or a thin right arrow) A binary function and . A => B is true unless A is true and B is false. The is A B | A => B ----+------- F F | T F T | T T F | F T T | T It is surprising at first that A => B is always true if A is false, but if X => Y then we would expect that (X & Z) => Y for any Z. (1995-09-30)
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