(************************************************************************)
(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
(* <O___,, * CNRS-Ecole Polytechnique-INRIA Futurs-Universite Paris Sud *)
(*   \VV/  **************************************************************)
(*    //   *      This file is distributed under the terms of the       *)
(*         *       GNU Lesser General Public License Version 2.1        *)
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(*i 	$Id$	 i*)
Section MapC.
Variables A B C : Type.

Lemma MapDomRestrBy_By_comm_c :
forall (m:Map A) (m':Map B) (m'':Map C),
mapcanon A m ->
MapDomRestrBy A C (MapDomRestrBy A B m m') m'' =
MapDomRestrBy A B (MapDomRestrBy A C m m'') m'.