1. N ⊃ (F • A) 2. B ⊃ (R • F) / (N ∨ B) ⊃ (A ∨ R) | 3. N ∨ B ACP | 4. (F • A) ∨ (R • F) 1,2,3, constructive dilemma CD | 5. (F • A) ∨ (F • R) 4, commutation | 6. F • (A ∨ R) 5, distribution | 7. (A ∨ R) • F 6, commutation | 8. A ∨ R 7, simplification 9. (N ∨ B) ⊃ (A ∨ R) 3-8 CP Edwin
Give reasons for the steps, given premises 1, 2 and 3: 1. X ⊃ (Y ⊃(answered by Edwin McCravy)