Consider the following premises. forall y: P_4(y) <-> W(y). forall y: T(y). P_4(d) <-> t. forall y: W(y) -> ~T(y). Can we infer forall y: P_4(y) <-> W(y) from them? If possible, name the inference rules being used at each step.
That is one of the premises. Therefore, the answer is yes.