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: U(z) or ~U_3(z). forall z: Q(z) <-> U(z). forall z: Q(z) -> U_3(z).
forall z: U_3(z) -> U(z) can be inferred via the universal rewriting rule. forall z: Q(z) -> U(z) can be inferred via the universal biconditional elimination rule. forall z: U(z) -> Q(z) can be inferred via the universal biconditional elimination rule.