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

Question 26

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. ∼(I ∨ \lor J)
2. J ⊃ (K ⊃ L)
3. K ≡ ∼L / L

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