Consider the following premises. forall x_8: Q_8(x_8) or ~P_8(x_8). forall x_8: P_8(x_8) <-> Q_8(x_8). Can we infer forall x_8: P_8(x_8) <-> Q_8(x_8) from them? If possible, name the inference rules being used at each step.
That is one of the premises. Therefore, the answer is yes.