End REC_COP3_XY.
Section REC_COP3_ALT.
(* structure de file d'attente *)
Variable c0 : Config.
Variable s0 s1 s2 : Site.
Hypothesis rt_true : rt c0 s2 = false.
Hypothesis not_owner : s1 <> owner.

Lemma rcop3_trans_alt :
D_queue (bm c0 s2 owner) ->
alternate (bm c0 s0 owner) ->
alternate (bm (rec_copy3_trans c0 s1 s2) s0 owner).