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_2(x) -> P_3(x). forall x: R_2(x) -> S(x). forall x: S(x) -> Q(x). forall x: P_3(x) -> R_2(x).
forall x: R_2(x) -> Q(x) can be inferred via the universal transitivity rule. forall x: P_3(x) -> S(x) can be inferred via the universal transitivity rule. forall x: R_2(x) <-> P_3(x) can be inferred via the universal biconditional introduction rule. forall x: P_3(x) <-> R_2(x) can be inferred via the universal biconditional introduction rule.