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: forall x: Q(x) <-> R(x). Q(b_1) -> R(b_1).
forall x: Q(x) -> R(x) can be inferred via the universal biconditional elimination rule. forall x: R(x) -> Q(x) can be inferred via the universal biconditional elimination rule.