Consider the following premises. r_1 -> R_12(a_12). forall x_12: R_12(x_12) <-> S_12(x_12). S_12(a_12) -> r_1. Can we infer r_1 -> R_12(a_12) from them? If possible, name the inference rules being used at each step.
That is one of the premises. Therefore, the answer is yes.