Consider the following premises. forall y_1: U_3(y_1) or ~U(y_1). exists y_1: U(y_1). forall y_1: W_1(y_1). Can we infer forall y_1: W_1(y_1) from them? If possible, name the inference rules being used at each step.
That is one of the premises. Therefore, the answer is yes.