What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: u_1 -> R_12(a). R_12(a) -> t_1. forall x_12: ~R_12(x_12). t_1 -> u_1.
R_12(a) -> u_1 can be inferred via the transitivity rule. t_1 -> R_12(a) can be inferred via the transitivity rule.