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Determine Whether the Given Proposition Is a Logical Truth of PL

Question 307

Essay

determine whether the given proposition is a logical truth of PL or not. If it is a logical truth, provide a proof. If it is not a logical truth, provide a false valuation.
-[A ⊃ (B ⊃ C)] ⊃ [(A ⊃ B) ⊃ (∼C ⊃ A)]

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