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(x). p_4 <-> ~w. w -> ~W(b_1).
p_4 -> ~w can be inferred via the biconditional elimination rule. ~w -> p_4 can be inferred via the biconditional elimination rule.