Module Import Private_Tac := !MakeOrderTac O O.
(** An alternative characterisation of [max], equivalent to [max_l /\ max_r] *)
(** A more symmetric version of [max_spec], based only on [le]. Beware that left and right alternatives overlap. *)
Instance : Proper (eq==>eq==>iff) le.
(** A function satisfying the same specification is equal to [max]. *)

Lemma max_unicity n m p :
((n < m /\ p == m) \/ (m <= n /\ p == n)) -> p == max n m.