0 votes 0 votes Justify the rule of universal modus tollens by showing that the premises $ \forall x (P(x) \rightarrow Q(x)) $ and $\sim Q(a)$for $a$ particular element $a$ in the domain, imply $\sim P(a)$ Mathematical Logic kenneth-rosen discrete-mathematics mathematical-logic propositional-logic + – Pooja Khatri asked Mar 19, 2019 Pooja Khatri 291 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.