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: T_1(y) -> R(y). forall y: T_1(y) or ~R(y). forall y: R(y) -> T_1(y).
forall y: R(y) -> T_1(y) can be inferred via the universal rewriting rule. exists y: T_1(y) <-> R(y) can be inferred via the existential biconditional introduction rule. exists y: R(y) <-> T_1(y) can be inferred via the existential biconditional introduction rule.