milestone update in basic_2

[helm.git] / matita / matita / contribs / lambdadelta / static_2 / static / feqg_length.ma

diff --git a/matita/matita/contribs/lambdadelta/static_2/static/feqg_length.ma b/matita/matita/contribs/lambdadelta/static_2/static/feqg_length.ma
new file mode 100644 (file)
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+++ b/matita/matita/contribs/lambdadelta/static_2/static/feqg_length.ma
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+(**************************************************************************)
+(*       ___                                                              *)
+(*      ||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/reqg_length.ma".
+include "static_2/static/feqg.ma".
+
+(* GENERIC EQUIVALENCE FOR CLOSURES ON REFERRED ENTRIES *********************)
+
+(* Forward lemmas with length for local environments ************************)
+
+lemma feqg_fwd_length (S) (G1) (G2) (L1) (L2) (T1) (T2):
+      ❪G1,L1,T1❫ ≛[S] ❪G2,L2,T2❫ → |L1| = |L2|.
+/3 width=6 by feqg_fwd_reqg_sn, reqg_fwd_length/ qed-.