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: T_1(x) <-> S(x). S(c_4) -> T_1(c_4).
forall x: T_1(x) -> S(x) can be inferred via the universal biconditional elimination rule. forall x: S(x) -> T_1(x) can be inferred via the universal biconditional elimination rule.