Question: 15. (P Q) [(P Q) (P Q)] Use conditional proof or indirect proof and the eighteen rules of inference to

15. (∼P ∨ Q) ⊃ [(P ∨ ∼Q) ⊃ (P ≡ Q)] Use conditional proof or indirect proof and the eighteen rules of inference to establish the truth of the following tautologies.

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