1 (**************************************************************************)
4 (* ||A|| A project by Andrea Asperti *)
6 (* ||I|| Developers: *)
7 (* ||T|| The HELM team. *)
8 (* ||A|| http://helm.cs.unibo.it *)
10 (* \ / This file is distributed under the terms of the *)
11 (* v GNU General Public License Version 2 *)
13 (**************************************************************************)
15 include "ground/relocation/gr_tl.ma".
16 include "ground/relocation/gr_isf.ma".
18 (* FINITE COLENGTH CONDITION FOR GENERIC RELOCATION MAPS ********************)
20 (* Constructions with gr_tl *************************************************)
23 lemma gr_isf_tl (f): 𝐅❪f❫ → 𝐅❪⫱f❫.
24 #f elim (gr_map_split_tl f) * #Hf
25 /3 width=3 by gr_isf_inv_push, gr_isf_inv_next/
28 (* Inversions with gr_tl ****************************************************)
31 lemma gr_isf_inv_tl (g): 𝐅❪⫱g❫ → 𝐅❪g❫.
32 #f elim (gr_map_split_tl f) * #Hf
33 /2 width=1 by gr_isf_next, gr_isf_push/