Consider the following premises. forall x_10: W(x_10) -> U(x_10). forall x_10: U(x_10) -> R(x_10). forall x_10: R(x_10) -> U(x_10). forall x_10: R(x_10) or W(x_10). Can we infer forall z: U(z) 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.