Section MESSAGE.
(* as formulated by Jean *)
(* As I need it in my proof *)

Lemma not_owner_inc4 :
forall (c : Config) (s1 s2 : Site),
legal c ->
forall (m : Message) (s0 : Site),
m = inc_dec s0 -> In_queue Message m (bm c s1 s2) -> s0 <> owner.