Give a direct and indirect proof of: (P ∨ R) ∨ (P → Q), ¬(P →
Q); R → (P → Q) ⇒ P
Give a direct and indirect proof of: (P ∨ R) ∨ (P → Q), ¬(P → Q); R → (P → Q) ⇒ P
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Give a direct and indirect proof of: (P ∨ R) ∨ (P → Q), ¬(P → Q); R → (P → Q) ⇒ P
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