Consider the following premises. R_6(i_2) -> q. forall x_12: U(x_12) <-> Q_12(x_12). forall x_12: Q_12(x_12) -> R_6(x_12). Can we infer U(i_2) 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.