401R1.2 Negating Logical Propositions

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  1. Matthew Salomone
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If you look at the four cases of If P then Q, the only time it's false is when P is true and Q is False, which seems to be what you would like: A true statement cannot imply a false one. On the other hand a false P can imply a true or a false Q. Example If the moon is made of cheese then all men are mortal is logically true. The point is, regardless of what the moon is made of all men are mortal! I think good way to "justify" what can appear illogical initially.

joetursi