modus tollens

<logic, philosophy of science> a rule of inference of the form:

	p -> q
	~ q
	~ p

Example: "If it had rained this morning, then the grass would still be wet. But the grass is not wet. Therefore, it did not rain this morning." A simple truth-table shows that any argument of this form must be valid.

[A Dictionary of Philosophical Terms and Names]


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Nearby terms: moderation « modernism « modus ponens « modus tollens » molecule » monad » monadic predicate logic