Prove the logical truth.
1. ~ (P ⊃ Q)
2. ~ (~ P v Q)
3. P • ~ Q
4. ~ Q
5. ~ Q v P
6. Q ⊃ P
7. ~ (P ⊃ Q) ⊃ (Q ⊃ P)
8. ~ ~ (P ⊃ Q) v (Q ⊃ P)
9. (P ⊃ Q) v (Q ⊃ P)
/ (P ⊃ Q) v (Q ⊃ P)
ACP
1 Impl
2 DM
3 Simp
4 Add
5 Impl
1-6 CP
7 Impl
8 DN
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