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: U(x). forall x: U_2(x) or P_4(x). forall x: W_1(x). forall x: ~U_2(x).
forall x: P_4(x) can be inferred via the universal disjunctive syllogism rule. forall x: U(x) and W_1(x) can be inferred via the universal conjunction rule. forall x: W_1(x) and U(x) can be inferred via the universal conjunction rule.