Consider the following premises. forall x_7: P_7(x_7) <-> W_2(x_7). forall x_7: W_2(x_7) -> T_1(x_7). forall x_7: P_7(x_7). Can we infer forall x_7: P_7(x_7) <-> W_2(x_7) from them? If possible, name the inference rules being used at each step.
That is one of the premises. Therefore, the answer is yes.