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: ~Q_2(i_4). t -> S_7(i_4). forall x_7: Q_2(x_7) <-> S_7(x_7).
forall x_7: Q_2(x_7) -> S_7(x_7) can be inferred via the universal biconditional elimination rule. forall x_7: S_7(x_7) -> Q_2(x_7) can be inferred via the universal biconditional elimination rule.