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Three step problem. For the following arguments, create a proof of the conclusion, with the given...

Three step problem. For the following arguments, create a proof of the conclusion, with the given premises.  

Part one: Use "conditional proof": P ⊃ Q /∴ P ⊃ (Q ∨ R)

Part two: Use "indirect proof": (A ∨ B) ⊃ (C ⋅ D) /∴ ~D ⊃ ~A

Part three: B ∨ ~(C ∨ D), (A ∨ B) ⊃ C /∴ B ≡ C

Math   Advanced-Math   
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