Consider the following premises. forall x_10: Q_10(x_10) -> P_10(x_10). forall x_10: P_10(x_10) -> Q_10(x_10). Q_10(a_9) -> P_10(a_9). Can we infer Q_10(a_9) -> P_10(a_9) from them? If possible, name the inference rules being used at each step.
That is one of the premises. Therefore, the answer is yes.