Consider the following premises. u or T(a_19). forall x_19: T(x_19) -> S_19(x_19). w -> ~u_1. u -> u_1. S_19(a_19) -> u_1. Can we infer w from them?
 From forall x_19: T(x_19) -> S_19(x_19) we can infer T(a_19) -> S_19(a_19). From T(a_19) -> S_19(a_19), S_19(a_19) -> u_1 we can infer T(a_19) -> u_1. From u -> u_1, T(a_19) -> u_1, u or T(a_19) we can infer u_1. Finally, from w -> ~u_1, u_1 we can infer ~w, which contradicts w. Therefore, the answer is no.