Consider the following premises. forall x_11: T(x_11) -> Q_11(x_11). forall x_11: P_4(x_11) -> T(x_11). exists x_11: P_4(x_11) <-> T(x_11). forall x_11: Q_11(x_11) -> P_4(x_11). Can we infer forall x_11: P_4(x_11) -> T(x_11) from them? If possible, name the inference rules being used at each step.
That is one of the premises. Therefore, the answer is yes.