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: W(x) or ~R_1(x). forall x: R_1(x) -> P(x). forall x: P(x) -> R_1(x).
exists x: R_1(x) -> W(x) can be inferred via the existential rewriting rule. forall x: R_1(x) <-> P(x) can be inferred via the universal biconditional introduction rule. forall x: P(x) <-> R_1(x) can be inferred via the universal biconditional introduction rule.