propagating the arithmetics library, partial commit

[helm.git] / matita / matita / contribs / lambdadelta / ground / relocation / rtmap_at_uni.ma

diff --git a/matita/matita/contribs/lambdadelta/ground/relocation/rtmap_at_uni.ma b/matita/matita/contribs/lambdadelta/ground/relocation/rtmap_at_uni.ma
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+(**************************************************************************)
+(*       ___                                                              *)
+(*      ||M||                                                             *)
+(*      ||A||       A project by Andrea Asperti                           *)
+(*      ||T||                                                             *)
+(*      ||I||       Developers:                                           *)
+(*      ||T||         The HELM team.                                      *)
+(*      ||A||         http://helm.tcs.unibo.it                            *)
+(*      \   /                                                             *)
+(*       \ /        This file is distributed under the terms of the       *)
+(*        v         GNU General Public License Version 2                  *)
+(*                                                                        *)
+(**************************************************************************)
+
+include "ground/arith/nat_rplus_succ.ma".
+include "ground/relocation/rtmap_uni.ma".
+include "ground/relocation/rtmap_at.ma".
+
+(* RELOCATION MAP ***********************************************************)
+
+(* Properties with uniform relocations **************************************)
+
+lemma at_uni: ∀n,i. @❪i,𝐔❨n❩❫ ≘ i+n.
+#n @(nat_ind_succ … n) -n /2 width=5 by at_next/
+qed.
+
+(* Inversion lemmas with uniform relocations ********************************)
+
+lemma at_inv_uni: ∀n,i,j. @❪i,𝐔❨n❩❫ ≘ j → j = i+n.
+/2 width=4 by at_mono/ qed-.