Consider the following premises. u -> ~S_23(a_23). forall x_23: R_23(x_23) -> S_23(x_23). q_15 -> S_23(a_23). R_23(a_23) or q_15. Can we infer ~w from them? If possible, name the inference rules being used at each step.
We cannot infer that from the premises. Therefore the answer is no.