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: exists x: R_4(x) -> Q(x). forall x: Q(x) -> S_2(x). forall x: R_4(x) or ~S_2(x).
exists x: R_4(x) -> S_2(x) can be inferred via the existential transitivity rule. forall x: S_2(x) -> R_4(x) can be inferred via the universal rewriting rule.