13 (P Q) (P Q) P Use conditional proof or indirect proof and the eighteen rules of inference to establish the truth of the following tautologies

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13  (P  Q)   (P  Q)  P  Use conditional proof or indirect proof and the eighteen rules of inference to establish the truth of the following tautologies

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Question: 13. (P Q) [(P Q) P] Use conditional proof or indirect proof and the eighteen rules of inference to establish the

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