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 z_3: R(z_3) <-> S_1(z_3). ~S_1(c_2). w. ~R(c_2) -> q_3.
~S_1(c_2) and w can be inferred via the conjunction rule. w and ~S_1(c_2) can be inferred via the conjunction rule. forall z_3: R(z_3) -> S_1(z_3) can be inferred via the universal biconditional elimination rule. forall z_3: S_1(z_3) -> R(z_3) can be inferred via the universal biconditional elimination rule.