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: exists z: T(z) <-> W_1(z). forall z: T(z) <-> W_1(z).
forall z: T(z) -> W_1(z) can be inferred via the universal biconditional elimination rule. exists z: T(z) -> W_1(z) can be inferred via the existential biconditional elimination rule. forall z: W_1(z) -> T(z) can be inferred via the universal biconditional elimination rule. exists z: W_1(z) -> T(z) can be inferred via the existential biconditional elimination rule.