QuestionQuestion

Either prove that the wff is a valid argument or give an interpretation in which it is false.
(∀x) P(x) V (∃x) Q(x) => (∀x) [P(x) V Q(x)]

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The wff is invalid for interpretations like below:
I).
P(x) = x is 1st day of Christmas (December 25)
Q(x) = Pearl Harbor attack was launched in that day (December 7)...

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