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 x: ~R(x). forall x: R(x) <-> Q_1(x). forall x: T(x) <-> Q_1(x). forall x: Q_1(x) -> T(x).
forall x: R(x) -> Q_1(x) can be inferred via the universal biconditional elimination rule. forall x: T(x) -> Q_1(x) can be inferred via the universal biconditional elimination rule. forall x: Q_1(x) -> R(x) can be inferred via the universal biconditional elimination rule. forall x: Q_1(x) -> T(x) can be inferred via the universal biconditional elimination rule. forall x: ~Q_1(x) can be inferred via the universal biconditional elimination rule.