Prove the logical truth.
10. P ⊃ [P • (Q v ~ Q)]
13. [P • (Q v ~ Q)] ⊃ P 14. { P ⊃ [P • (Q v ~ Q)]} • { P ⊃ [P • (Q v ~ Q)]} 15. P ≡ [P • (Q v ~ Q)] | / P ≡ [P • (Q v ~ Q)] 1 ACP 2 ACP 1-2 MP 1,3 Conj 2-4 CP 5 Impl 6 Impl 7 DM 8 Dist 1-9 CP ACP 11 Simp 11-12 CP 10,13 Conj 14 Equiv |
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