Determine Whether the Given Formula Is a Logical Truth of M

question 140

Multiple Choice

determine whether the given formula is a logical truth of M or not. If it is not a logical truth, select a false valuation.
-[(∃x) Ex • (∃x) ∼Ex) ] ⊃ (∀x) (Ex $\lor$ ∼Ex)

• A) Logical truth
• B) Not a logical truth. False valuation in a domain of 2 members, in which: Ea: True
• Ea: False
• C) Not a logical truth. False valuation in a domain of 2 members, in which: Ea: True
• Ea: True
• D) Not a logical truth. False valuation in a domain of 2 members, in which: Ea: False
• Ea: False
• E) Not a logical truth. False valuation in a domain of 2 members, in which: Ea: False
• Ea: True

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