14. Modus ponens identifies the necessary additional fact to convert a proof of the truth of the...

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14. Modus ponens identifies the necessary additional fact to convert a proof of the truth of the implication, P ) Q, into a proof of the conclusion, Q. Confirm that P5ðP ) QÞ ) Q is a tautology. Demonstrate by real world examples as in exercise 2 that while ðP ) QÞ ) Q can be true or false, P5ðP ) QÞ ) Q is always true.

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