An inference is deductively valid if its conclusion follows logically from its premises, i.
May 10, 2021 · Modus tollens. A is not B. - In the movie “Monty Python and the Holy Grail” we encounter a medieval villager who (with a bit of prompting) makes the following argument. Fallacy of affirming the consequent, Fallacy of denying the antecedent.
- This is a simple example of modus tollens: In the next example, I'm applying modus tollens with P replaced by C and Q replaced by : The last example shows how you're allowed to "suppress" double negation steps. If A is B, C is D; C is not D:.
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