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: W_1(z) <-> U_1(z). forall z: ~W_1(z).
forall z: W_1(z) -> U_1(z) can be inferred via the universal biconditional elimination rule. forall z: U_1(z) -> W_1(z) can be inferred via the universal biconditional elimination rule. forall z: ~U_1(z) can be inferred via the universal biconditional elimination rule.