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: T_3(y) <-> T(y). forall y: ~T_3(y). exists y: S(y) <-> T(y).
forall y: T_3(y) -> T(y) can be inferred via the universal biconditional elimination rule. exists y: S(y) -> T(y) can be inferred via the existential biconditional elimination rule. forall y: T(y) -> T_3(y) can be inferred via the universal biconditional elimination rule. exists y: T(y) -> S(y) can be inferred via the existential biconditional elimination rule. forall y: ~T(y) can be inferred via the universal biconditional elimination rule.