End DEL_EFFECT.
Section DEL_CTRL.
(* decompte de messages *)
Variable c0 : Config.
Variable s0 s1 : Site.

Lemma del_trans_ctrl_copy :
forall s2 : Site,
ctrl_copy s0 s2 (bm (delete_trans c0 s1)) = ctrl_copy s0 s2 (bm c0).