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Give natural deduction proof of the following derived rule: (forall x. P(x)) logicaland (forall y. P(y) rightarrow Q(y))/forall z.Q(z) This is a quantified version of

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Give natural deduction proof of the following derived rule: (forall x. P(x)) logicaland (forall y. P(y) rightarrow Q(y))/forall z.Q(z) This is a quantified version of implication elimination. Again one only needs elimination (forall-E) and introduction (forall-I)

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