Consider the following premises. p -> P_15(a_12). Q_15(a_12) -> p. forall x_15: P_15(x_15) <-> Q_15(x_15). Can we infer forall x_15: P_15(x_15) <-> Q_15(x_15) from them? If possible, name the inference rules being used at each step.
That is one of the premises. Therefore, the answer is yes.