Consider the following premises. forall x_10: ~P_6(x_10) or P_4(x_10). forall x_10: ~Q_10(x_10). forall x_10: P_10(x_10) <-> Q_10(x_10). forall x_10: P_6(x_10) or P_10(x_10). Can we infer forall x_10: P_10(x_10) <-> Q_10(x_10) from them? If possible, name the inference rules being used at each step.
That is one of the premises. Therefore, the answer is yes.