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: R_3(y) <-> T_1(y). forall y: T_1(y) or U_1(y). forall y: R_3(y) or ~U_1(y).
forall y: U_1(y) -> R_3(y) can be inferred via the universal rewriting rule. forall y: R_3(y) -> T_1(y) can be inferred via the universal biconditional elimination rule. forall y: T_1(y) -> R_3(y) can be inferred via the universal biconditional elimination rule.