Consider the following premises. exists z_3: Q(z_3). forall z_3: R_1(z_3) or U_2(z_3). forall z_3: U_2(z_3) -> T(z_3). forall z_3: R_1(z_3) -> T(z_3). Can we infer forall z_3: U_2(z_3) -> T(z_3) from them? If possible, name the inference rules being used at each step.
That is one of the premises. Therefore, the answer is yes.