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_1(z) <-> T_3(z). exists z: T_3(z) or ~T_1(z).
exists z: T_1(z) -> T_3(z) can be inferred via the existential rewriting rule. forall z: T_1(z) -> T_3(z) can be inferred via the universal biconditional elimination rule. forall z: T_3(z) -> T_1(z) can be inferred via the universal biconditional elimination rule.