Consider the following premises. forall x_7: Q_7(x_7) <-> Q_4(x_7). forall x_7: U_2(x_7) <-> Q_7(x_7). forall x_7: ~Q_4(x_7). Can we infer forall x_7: ~U_2(x_7) from them?
 From forall x_7: U_2(x_7) <-> Q_7(x_7) we can infer forall x_7: U_2(x_7) -> Q_7(x_7). From forall x_7: Q_7(x_7) <-> Q_4(x_7), forall x_7: ~Q_4(x_7) we can infer forall x_7: ~Q_7(x_7). Finally, from forall x_7: U_2(x_7) -> Q_7(x_7), forall x_7: ~Q_7(x_7) we can infer forall x_7: ~U_2(x_7). Therefore, the answer is yes.