Section REC_DEC_CTRL.
(* decompte de messages *)
Variable c0 : Config.
Variable s0 s1 s2 : Site.
Hypothesis first_mess : first Message (bm c0 s1 s2) = value Message dec.

Lemma rdec_trans_ctrl_copy :
forall s3 : Site,
ctrl_copy s0 s3 (bm (rec_dec_trans c0 s1 s2)) = ctrl_copy s0 s3 (bm c0).