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(x). forall x: R(x) <-> W(x).
exists x: R(x) -> W(x) can be inferred via the existential rewriting rule. forall x: R(x) -> W(x) can be inferred via the universal biconditional elimination rule. forall x: W(x) -> R(x) can be inferred via the universal biconditional elimination rule.