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(x) or U(x). exists x: S_2(x) and S(x). forall x: ~R(x).
forall x: U(x) can be inferred via the universal disjunctive syllogism rule. exists x: S_2(x) can be inferred via the existential simplification rule. exists x: S(x) can be inferred via the existential simplification rule.