Consider the following premises. forall x_8: Q(x_8) <-> T_4(x_8). forall x_8: Q(x_8). forall x_8: R_1(x_8). Can we infer forall x_8: T_4(x_8) from them?
 From forall x_8: Q(x_8) <-> T_4(x_8) we can infer forall x_8: Q(x_8) -> T_4(x_8). From forall x_8: Q(x_8), forall x_8: R_1(x_8) we can infer forall x_8: Q(x_8) and R_1(x_8). From forall x_8: Q(x_8) and R_1(x_8) we can infer forall x_8: Q(x_8). Finally, from forall x_8: Q(x_8) -> T_4(x_8), forall x_8: Q(x_8) we can infer forall x_8: T_4(x_8). Therefore, the answer is yes.