Consider the following premises. forall x_13: Q_13(x_13). exists x_13: P(x_13). forall x_13: ~P(x_13). Can we infer forall x_13: ~U(x_13) from them? If possible, name the inference rules being used at each step.
The premises are contradictory and we can infer anything from them. Therefore, the answer is yes.