(* For consistency with Rplus_opp_r and Rplus_opp_l. *)
Definition Rmult_inv_r := Rinv_r.Definition Rmult_inv_l := Rinv_l.

Lemma Rminus_plus_distr : forall r1 r2 r3, r1 - (r2 + r3) = (r1 - r2) - r3.