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(* modify it under the terms of the GNU Lesser General Public License *)
(* as published by the Free Software Foundation; either version 2.1   *)
(* of the License, or (at your option) any later version.             *)
(*                                                                    *)
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(* but WITHOUT ANY WARRANTY; without even the implied warranty of     *)
(* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the      *)
(* GNU General Public License for more details.                       *)
(*                                                                    *)
(* You should have received a copy of the GNU Lesser General Public   *)
(* License along with this program; if not, write to the Free         *)
(* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA *)
(* 02110-1301 USA                                                     *)
(** %\subsection*{ support :  concat\_facts.v }%*)
Set Implicit Arguments.
Unset Strict Implicit.
Require Export concat.
Require Export empty.
Section MAIN.
Variable A : Setoid.
Variable n m : Nat.
Variable v : seq n A.
Variable w : seq m A.
(** - More facts about concatenation *)

(* Specifications: *)
Lemma concat_first_part :
forall (i : Nat) (Hi : i < n) (Hi' : i < n + m),
(v ++ w) (Build_finiteT Hi') =' v (Build_finiteT Hi) in _.