Section REC_DEC_ALT.
(* structure de file *)
Variable c0 : Config.
Variable s0 s1 s2 : Site.

(* Specifications: *)
Lemma rdec_trans_D :
D_queue (bm c0 s0 owner) -> D_queue (bm (rec_dec_trans c0 s1 s2) s0 owner).
Lemma rdec_trans_alt :
alternate (bm c0 s0 owner) ->
alternate (bm (rec_dec_trans c0 s1 s2) s0 owner).