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 y: Q(y) <-> T_2(y). forall y: Q(y) -> T_2(y).
exists y: Q(y) -> T_2(y) can be inferred via the existential biconditional elimination rule. exists y: T_2(y) -> Q(y) can be inferred via the existential biconditional elimination rule.