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. D ⊃ (E • F)
2. D ≡ (E $ \lor $ ∼F) / ∼E ⊃ ∼D

Question

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The Answer of 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. D ⊃ (E • F)
2. D ≡ (E $ \lor $ ∼F) / ∼E ⊃ ∼D

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

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