Give a natural deduction proof of ∀z.((∀x.P(x) → Q(x)) ∧ ¬Q(z) →¬P(z)).
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Give a natural deduction proof of ∀z.((∀x.P(x) → Q(x)) ∧ ¬Q(z) →¬P(z)).
An answer will be send to you shortly. . . . .