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: T_3(z) <-> T(z). forall z: U(z) -> T_3(z). forall z: T(z) -> U(z).
forall z: T(z) -> T_3(z) can be inferred via the universal transitivity rule. forall z: T_3(z) -> T(z) can be inferred via the universal biconditional elimination rule. forall z: T(z) -> T_3(z) can be inferred via the universal biconditional elimination rule.