Consider the following premises. forall x_23: ~R_23(x_23). R_23(a_23) or p. ~p_3 -> w. p_3 -> ~p. Can we infer w from them?
 From forall x_23: ~R_23(x_23) we can infer ~R_23(a_23). From R_23(a_23) or p, ~R_23(a_23) we can infer p. From p_3 -> ~p, p we can infer ~p_3. Finally, from ~p_3 -> w, ~p_3 we can infer w. Therefore, the answer is yes.