What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: forall x: Q(x) -> W(x). exists x: ~W(x). forall x: W(x) -> Q(x).
exists x: ~Q(x) can be inferred via the existential modus tollens rule. forall x: Q(x) <-> W(x) can be inferred via the universal biconditional introduction rule. forall x: W(x) <-> Q(x) can be inferred via the universal biconditional introduction rule.