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 z_4: Q(z_4) -> W(z_4). t_3. forall z_4: W(z_4) -> Q(z_4). W(i) -> ~t_3.
~W(i) can be inferred via the modus tollens rule. forall z_4: Q(z_4) <-> W(z_4) can be inferred via the universal biconditional introduction rule. forall z_4: W(z_4) <-> Q(z_4) can be inferred via the universal biconditional introduction rule.