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(* as published by the Free Software Foundation; either version 2.1   *)
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(* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the      *)
(* GNU General Public License for more details.                       *)
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(* 02110-1301 USA                                                     *)
Require Export Max.
(* lemmes concernant max *)
(* lemmes arithmétiques *)

Lemma le_disj : forall n m : nat, n <= m -> n = m \/ S n <= m.