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Determine Whether the Given Argument Is Valid or Invalid ∨ \lor

Question 88

Essay

determine whether the given argument is valid or invalid. If it is valid, provide a derivation of the conclusion from the premises. If it is invalid, provide a counterexample.
-1. ∼(E ∨ \lor F)
2. ∼F ⊃ (G ⊃ H)
3. G ≡ ∼H / ∼G

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