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 y: S(y) <-> S_1(y). forall y: Q_3(y) or S_1(y). forall y: Q_3(y) -> S(y).
forall y: S(y) -> S_1(y) can be inferred via the universal biconditional elimination rule. forall y: S_1(y) -> S(y) can be inferred via the universal biconditional elimination rule.