Consider the following premises. forall x_3: P_3(x_3) -> U(x_3). exists x_3: ~U(x_3) or T(x_3). forall x_3: P_3(x_3). Can we infer forall x_3: P_3(x_3) from them? If possible, name the inference rules being used at each step.
That is one of the premises. Therefore, the answer is yes.