Consider the following premises. R_13(f) -> Q_4(f). forall x_13: Q_13(x_13) -> R_13(x_13). forall x_13: Q_4(x_13) -> Q_13(x_13). R_13(f). Can we infer ~u 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.