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) -> R_2(z). exists z: T_3(z) <-> U_1(z). forall z: ~R_2(z).
forall z: ~T_3(z) can be inferred via the universal modus tollens rule. exists z: T_3(z) -> U_1(z) can be inferred via the existential biconditional elimination rule. exists z: U_1(z) -> T_3(z) can be inferred via the existential biconditional elimination rule.