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_3(j). forall y_4: R_3(y_4) -> Q_3(y_4). forall y_4: Q_3(y_4) -> R_3(y_4).
forall y_4: R_3(y_4) <-> Q_3(y_4) can be inferred via the universal biconditional introduction rule. forall y_4: Q_3(y_4) <-> R_3(y_4) can be inferred via the universal biconditional introduction rule.