Consider the following premises. forall x: T_2(x) <-> Q_4(x). forall x: T_2(x) <-> Q_4(x). Can we infer forall x: T_2(x) -> Q_4(x) from them?
 From forall x: T_2(x) <-> Q_4(x) we can infer forall x: Q_4(x) -> T_2(x). Finally, from forall x: T_2(x) <-> Q_4(x) we can infer forall x: T_2(x) -> Q_4(x). Therefore, the answer is yes.