Consider the following premises. forall x_6: Q_6(x_6) -> P(x_6). forall x_6: P_6(x_6) or Q_6(x_6). forall x_6: R_6(x_6) -> P(x_6). forall x_6: ~P_6(x_6) or R_6(x_6). Can we infer ~U_4(j_3) from them? If possible, name the inference rules being used at each step.
We cannot infer that from the premises. Therefore the answer is no.