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: ~W(f). Q_2(f) <-> W(f). forall z: W(z) -> Q_2(z).
Q_2(f) -> W(f) can be inferred via the biconditional elimination rule. W(f) -> Q_2(f) can be inferred via the biconditional elimination rule.