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: R_1(a_4) -> R(a_4). forall x: R_1(x) <-> R(x).
forall x: R_1(x) -> R(x) can be inferred via the universal biconditional elimination rule. forall x: R(x) -> R_1(x) can be inferred via the universal biconditional elimination rule.