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    Philosophy
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    Introduction to Formal Logic with Philosophical Applications
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    Exam 4: Monadic Predicate Logic
  5. Question
    Determine Whether the Given Formula Is a Logical Truth of M
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Determine Whether the Given Formula Is a Logical Truth of M

Question 228

Question 228

Essay

determine whether the given formula is a logical truth of M or not. If it is a logical truth, provide a proof of the formula. If it is not a logical truth, provide a counterexample in a finite domain.
-[(∃x)Ex • (∃x)∼Ex] ⊃ (∀x)(Ex ∨ \lor ∨ ∼Ex)

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