Determine Whether the Given Formula Is a Logical Truth of M

question 183

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) (Ix • Jx) ⊃ [(∀x) Ix ⊃ (∀x) Jx]

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

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