Consider the following premises. forall z_2: T(z_2) or U_3(z_2). forall z_2: T(z_2) -> R(z_2). forall z_2: ~R(z_2). r_4. Can we infer U_3(a_9) -> r_4 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.