Exercise 5-6 Prove that the following sentences are theorems. please help with 1,5,7,9 (1) A ⊃ (A ∨ B) (5)(A ∨ B) ⊃ [C ⊃ (A ∨ B)] (7) (A ∨ B) ⊃ [(A ⊃ B) ∨ (B ⊃ A)] (9) (A ⊃ B) ≡ (∼ B ⊃ ∼ A)

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