Consider the following premises. forall x_5: W_4(x_5). forall x_5: P_5(x_5) or Q_5(x_5). forall x_5: Q_5(x_5) -> U(x_5). forall x_5: P_5(x_5) -> U(x_5). Can we infer forall x_5: P_5(x_5) or Q_5(x_5) from them? If possible, name the inference rules being used at each step.
That is one of the premises. Therefore, the answer is yes.