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: Q(y) <-> T(y). exists y: R(y) -> T(y). forall y: Q(y) -> R(y).
exists y: Q(y) -> T(y) can be inferred via the existential transitivity rule. forall y: Q(y) -> T(y) can be inferred via the universal biconditional elimination rule. forall y: T(y) -> Q(y) can be inferred via the universal biconditional elimination rule.