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_8: T(x_8) -> P_3(x_8). forall x_8: T(x_8) -> ~Q_8(x_8). forall x_8: T(x_8) -> P_3(x_8). forall x_8: P_3(x_8) -> T(x_8). forall x_8: Q_8(x_8).
forall x_8: ~T(x_8) can be inferred via the universal modus tollens rule. forall x_8: T(x_8) <-> P_3(x_8) can be inferred via the universal biconditional introduction rule. forall x_8: T(x_8) <-> P_3(x_8) can be inferred via the universal biconditional introduction rule. forall x_8: P_3(x_8) <-> T(x_8) can be inferred via the universal biconditional introduction rule. forall x_8: P_3(x_8) <-> T(x_8) can be inferred via the universal biconditional introduction rule.