Module Import Private_BootStrap.
(** ** Operations and constants *)
(** ** Addition is commutative *)
(** ** Opposite distributes over addition *)
(** ** Opposite is injective *)
(** ** Addition is associative *)
Local Arguments add !x !y.
(** ** Opposite is inverse for addition *)
(** ** Multiplication and Opposite *)

Lemma mul_opp_r n m : n * - m = - (n * m).