Consider the following premises. P_8(a_7) or u. forall x_8: P_8(x_8) -> Q_8(x_8). forall x_8: Q_8(x_8) -> P_8(x_8). u -> Q_8(a_7). Can we infer u_1 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.