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_3: R_2(z_3). forall z_3: Q_4(z_3) <-> R_2(z_3).
forall z_3: Q_4(z_3) -> R_2(z_3) can be inferred via the universal biconditional elimination rule. forall z_3: R_2(z_3) -> Q_4(z_3) can be inferred via the universal biconditional elimination rule.