Consider the following premises. forall x_16: P_16(x_16). forall x_16: P_16(x_16) <-> Q_16(x_16). Can we infer Q_16(h) or u from them? If possible, name the inference rules being used at each step.
 From forall x_16: P_16(x_16) <-> Q_16(x_16) we can infer forall x_16: P_16(x_16) -> Q_16(x_16) via universal biconditional elimination. From forall x_16: P_16(x_16) -> Q_16(x_16), forall x_16: P_16(x_16) we can infer forall x_16: Q_16(x_16) via universal modus ponens. From forall x_16: Q_16(x_16) we can infer Q_16(h) via universal instantiation. Finally, from Q_16(h) we can infer Q_16(h) or u via addition. Therefore, the answer is yes.