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: P_3(x) or Q(x). forall x: Q(x) -> R(x). exists x: P_3(x) -> R(x).
exists x: R(x) can be inferred via the existential disjunction elimination rule.