update in ground_2 static_2 basic_2

[helm.git] / matita / matita / contribs / lambdadelta / basic_2 / rt_computation / cpmhe_csx.ma

diff --git a/matita/matita/contribs/lambdadelta/basic_2/rt_computation/cpmhe_csx.ma b/matita/matita/contribs/lambdadelta/basic_2/rt_computation/cpmhe_csx.ma
new file mode 100644 (file)
index 0000000..d821c84
--- /dev/null
+++ b/matita/matita/contribs/lambdadelta/basic_2/rt_computation/cpmhe_csx.ma
@@ -0,0 +1,41 @@
+(**************************************************************************)
+(*       ___                                                              *)
+(*      ||M||                                                             *)
+(*      ||A||       A project by Andrea Asperti                           *)
+(*      ||T||                                                             *)
+(*      ||I||       Developers:                                           *)
+(*      ||T||         The HELM team.                                      *)
+(*      ||A||         http://helm.cs.unibo.it                             *)
+(*      \   /                                                             *)
+(*       \ /        This file is distributed under the terms of the       *)
+(*        v         GNU General Public License Version 2                  *)
+(*                                                                        *)
+(**************************************************************************)
+
+include "basic_2/rt_transition/cpm_cpx.ma".
+include "basic_2/rt_transition/cnh_tdeq.ma".
+include "basic_2/rt_computation/csx.ma".
+include "basic_2/rt_computation/cpmhe.ma".
+
+(* HEAD T-UNBOUND EVALUATION FOR T-BOUND RT-TRANSITION ON TERMS *************)
+
+(* Properties with strong normalization for unbound rt-transition for terms *)
+
+lemma cpmhe_total_csx (h) (G) (L):
+      ∀T1. ⦃G,L⦄ ⊢ ⬈*[h] 𝐒⦃T1⦄ → ∃∃T2,n. ⦃G,L⦄ ⊢ T1 ➡*[h,n] 𝐍*⦃T2⦄.
+#h #G #L #T1 #H
+@(csx_ind … H) -T1 #T1 #_ #IHT1
+elim (cnh_dec_tdeq h G L T1)
+[ -IHT1 #HT1 /3 width=4 by cpmhe_intro, ex1_2_intro/
+| * #n1 #T0 #HT10 #HnT10
+  elim (IHT1 … HnT10) -IHT1 -HnT10 [| /2 width=2 by cpm_fwd_cpx/ ]
+  #T2 #n2 * #HT02 #HT2 /4 width=5 by cpms_step_sn, cpmhe_intro, ex1_2_intro/
+]
+qed-.
+
+lemma R_cpmhe_total_csx (h) (G) (L):
+      ∀T1. ⦃G,L⦄ ⊢ ⬈*[h] 𝐒⦃T1⦄ → ∃n. R_cpmhe h G L T1 n.
+#h #G #L #T1 #H
+elim (cpmhe_total_csx … H) -H #T2 #n #HT12
+/3 width=3 by ex_intro (* 2x *)/
+qed-.