update in static_2

[helm.git] / matita / matita / contribs / lambdadelta / static_2 / etc / teqx / feqx_req.etc

diff --git a/matita/matita/contribs/lambdadelta/static_2/etc/teqx/feqx_req.etc b/matita/matita/contribs/lambdadelta/static_2/etc/teqx/feqx_req.etc
new file mode 100644 (file)
index 0000000..466275a
--- /dev/null
+++ b/matita/matita/contribs/lambdadelta/static_2/etc/teqx/feqx_req.etc
@@ -0,0 +1,27 @@
+(**************************************************************************)
+(*       ___                                                              *)
+(*      ||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 "static_2/static/reqx_req.ma".
+include "static_2/static/feqx.ma".
+
+(* SORT-IRRELEVANT EQUIVALENCE FOR CLOSURES ON REFERRED ENTRIES *************)
+
+(* Properties with syntactic equivalence on referred entries ****************)
+
+lemma req_feqx_trans: ∀L1,L,T1. L1 ≡[T1] L →
+                      ∀G1,G2,L2,T2. ❪G1,L,T1❫ ≛ ❪G2,L2,T2❫ → ❪G1,L1,T1❫ ≛ ❪G2,L2,T2❫.
+#L1 #L #T1 #HL1 #G1 #G2 #L2 #T2 #H
+elim (feqx_inv_gen_sn … H) -H #H #HL2 #T12 destruct
+/3 width=3 by feqx_intro_sn, req_reqx_trans/
+qed-.