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 x: U(x) -> T_1(x). forall x: W(x) -> U(x). forall x: W(x) <-> T_1(x).
exists x: W(x) -> T_1(x) can be inferred via the existential transitivity rule. forall x: W(x) -> T_1(x) can be inferred via the universal biconditional elimination rule. forall x: T_1(x) -> W(x) can be inferred via the universal biconditional elimination rule.