+++ /dev/null
-(**************************************************************************)
-(* ___ *)
-(* ||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/element_i_0.ma".
-include "ground/relocation/gr_map.ma".
-
-(* IDENTITY ELEMENT FOR GENERIC RELOCATION MAPS *****************************)
-
-(*** id *)
-corec definition gr_id: gr_map ≝ ⫯gr_id.
-
-interpretation
- "identity element (generic relocation streams)"
- 'ElementI = (gr_id).
-
-(* Basic constructions (specific) *******************************************)
-
-(*** id_rew *)
-lemma gr_id_unfold: ⫯𝐢 = 𝐢.
-<(stream_unfold … (𝐢)) in ⊢ (???%); //
-qed.