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: ~w. w <-> u. forall z: W(z) or W_2(z). W(g) -> u.
w -> u can be inferred via the biconditional elimination rule. u -> w can be inferred via the biconditional elimination rule. ~u can be inferred via the biconditional elimination rule.