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: W_2(x) <-> W(x). ~W(a_2). forall x: W(x) -> W_2(x).
forall x: W_2(x) -> W(x) can be inferred via the universal biconditional elimination rule. forall x: W(x) -> W_2(x) can be inferred via the universal biconditional elimination rule.