Section COPY_EFFECT.
(* invariants *)
Variable c0 : Config.
Variable s1 s2 : Site.
Hypothesis diff_s1_s2 : s1 <> s2.

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