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by cortesoft
1119 days ago
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In formal logic, it is known as "modus tollens"... if 'if x then y' is true, then 'if not y then not x' is also true. The inverse is not necessarily true, however: 'if x then y' does not mean 'if y then x'. In the case of a an X that is hard to figure out on its own, and it is easy to figure out Y, then it might be worth testing Y first, even if you will only get useful information if Y is false. |
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