Question

Prove a)p→q, r→s⊢p∨r→q∨s b)(p ∨ (q → p)) ∧ q ⊢ p

Prove

a)p→q, r→s⊢p∨r→q∨s

b)(p ∨ (q → p)) ∧ q ⊢ p

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