update in bsasic_2

+ cnv_cpce_trans_lpce started

diff --git a/matita/matita/contribs/lambdadelta/basic_2/dynamic/cnv_lpce.ma b/matita/matita/contribs/lambdadelta/basic_2/dynamic/cnv_lpce.ma
new file mode 100644 (file)
index 0000000..61d4bf4
--- /dev/null
+++ b/matita/matita/contribs/lambdadelta/basic_2/dynamic/cnv_lpce.ma
@@ -0,0 +1,26 @@
+(**************************************************************************)
+(*       ___                                                              *)
+(*      ||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_conversion/lpce.ma".
+include "basic_2/dynamic/cnv.ma".
+
+(* CONTEXT-SENSITIVE NATIVE VALIDITY FOR TERMS ******************************)
+
+theorem cnv_cpce_trans_lpce (h) (G):
+        ∀L1,T1,T2. ⦃G,L1⦄ ⊢ T1 ⬌η[h] T2 → ⦃G,L1⦄ ⊢ T1 !*[h] →
+        ∀L2. ⦃G,L1⦄ ⊢ ⬌η[h] L2 → ⦃G,L2⦄ ⊢ T2 !*[h].
+#h #G #L1 #T1 #T2 #H elim H -G -L1 -T1 -T2
+[ #G #L1 #s #_ #L2 #_ //
+| #G #K1 #V1 #_ #Y2 #HY
+  elim (lpce_inv_pair_sn … HY) -HY #K2 #V2 #HK #HV #H destruct               
\ No newline at end of file