Definition rec_copy1_trans (c : Config) (s1 s2 : Site) :=
  mkconfig (S (time c)) (dt c) (st c) (rt c)
    (Post_message dec (Collect_message (bm c) s1 s2) s2 s1).

Lemma rcop1_trans_le_dt_time : forall s0 : Site, dt c0 s0 <= time c0 -> dt (rec_copy1_trans c0 s1 s2) s0 <= time (rec_copy1_trans c0 s1 s2).