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: exists z: T(z) or P(z). forall z: P(z) -> S(z). forall z: S(z) -> P(z). forall z: ~T(z).
exists z: P(z) can be inferred via the existential disjunctive syllogism rule. forall z: P(z) <-> S(z) can be inferred via the universal biconditional introduction rule. forall z: S(z) <-> P(z) can be inferred via the universal biconditional introduction rule.