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(j) -> ~w_4. w_4. forall z: S(z) <-> R(z).
~R(j) can be inferred via the modus tollens rule. forall z: S(z) -> R(z) can be inferred via the universal biconditional elimination rule. forall z: R(z) -> S(z) can be inferred via the universal biconditional elimination rule.