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: T_2(x) <-> S(x). exists x: Q_3(x). forall x: Q_3(x) -> S(x).
exists x: S(x) can be inferred via the existential modus ponens rule. forall x: T_2(x) -> S(x) can be inferred via the universal biconditional elimination rule. forall x: S(x) -> T_2(x) can be inferred via the universal biconditional elimination rule.