I Know Something If, and Only If, I Have Some

question 20

Multiple Choice

I know something if, and only if, I have some causal contact with the physical world. If I know something, then there is no demon deceiver. I know something. So, I know something just in case both I have causal contact with the physical world and there is no demon deceiver.
-Which of the following is the best translation into PL of this argument?

• A) K ≡ C K ⊃ ∼D
• K / K ≡ (C • ∼D)
• B) K ≡ C K ⊃ ∼D
• K / (K ≡ C) • ∼D
• C) K ≡ C K ≡ ∼D
• K / K ≡ (C • ∼D)
• D) K ≡ C ∼D ⊃ K
• K / K ≡ (C • ∼D)
• E) K ≡ C ∼D ⊃ K
• K / (K ≡ C) • ∼D

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