milestone update in ground

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

diff --git a/matita/matita/contribs/lambdadelta/ground/relocation/gr_tl.ma b/matita/matita/contribs/lambdadelta/ground/relocation/gr_tl.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 "ground/notation/functions/droppred_1.ma".
+include "ground/lib/stream_hdtl.ma".
+include "ground/relocation/gr_map.ma".
+
+(* TAIL FOR GENERIC RELOCATION MAPS ***********************************************************)
+
+(*** tl *)
+definition gr_tl (f): gr_map ≝ ⫰f.
+
+interpretation
+  "tail (generic relocation maps)"
+  'DropPred f = (gr_tl f).
+
+(* Basic properties *********************************************************)
+
+(*** tl_push_rew *)
+lemma gr_tl_push (f): f = ⫱⫯f.
+// qed.
+
+(*** tl_next_rew *)
+lemma gr_tl_next (f): f = ⫱↑f.
+// qed.
+
+(* Basic eliminators ********************************************************)
+
+(*** pn_split gr_map_split *)
+lemma gr_map_split_tl (f): ∨∨ ⫯⫱f = f | ↑⫱f = f.
+* * /2 width=1 by or_introl, or_intror/
+qed-.