Question: Use conditional proof or indirect proof and the eighteen rules of inference to establish the truth of the following tautologies.

Use conditional proof or indirect proof and the eighteen rules of inference to establish the truth of the following tautologies.

(PQ) v (QP)

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To establish the truth of the tautology P Q Q P using conditional proof we will assume the antecedent of one of the conditionals and prove the consequ... View full answer

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