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 x: R_1(x) -> S(x). forall x: S(x) -> U(x). forall x: S(x) or ~R_1(x). forall x: U(x) -> R_1(x).
forall x: R_1(x) -> U(x) can be inferred via the universal transitivity rule. forall x: S(x) -> R_1(x) can be inferred via the universal transitivity rule. forall x: U(x) -> S(x) can be inferred via the universal transitivity rule. forall x: R_1(x) -> S(x) can be inferred via the universal rewriting rule.