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diff --git a/theories7/Setoids/Setoid.v b/theories7/Setoids/Setoid.v
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-(************************************************************************)
-(*  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        *)
-(************************************************************************)
-
-(*i $Id: Setoid.v,v 1.1.2.1 2004/07/16 19:31:38 herbelin Exp $: i*)
-
-Section Setoid.
-
-Variable A : Type.
-Variable Aeq : A -> A -> Prop.
-
-Record Setoid_Theory : Prop :=
-{ Seq_refl : (x:A) (Aeq x x);
-  Seq_sym : (x,y:A) (Aeq x y) -> (Aeq y x);
-  Seq_trans : (x,y,z:A) (Aeq x y) -> (Aeq y z) -> (Aeq x z)
-}.
-
-End Setoid.
-
-Definition Prop_S : (Setoid_Theory Prop iff).
-Split; [Exact iff_refl | Exact iff_sym | Exact iff_trans].
-Qed.
-
-Add Setoid Prop iff Prop_S.
-
-Hint prop_set : setoid := Resolve (Seq_refl Prop iff Prop_S).
-Hint prop_set : setoid := Resolve (Seq_sym Prop iff Prop_S).
-Hint prop_set : setoid := Resolve (Seq_trans Prop iff Prop_S).
-
-Add Morphism or : or_ext.
-Intros.
-Inversion H1.
-Left.
-Inversion H.
-Apply (H3 H2).
-
-Right.
-Inversion H0.
-Apply (H3 H2).
-Qed.
-
-Add Morphism and : and_ext.
-Intros.
-Inversion H1.
-Split.
-Inversion H.
-Apply (H4 H2).
-
-Inversion H0.
-Apply (H4 H3).
-Qed.
-
-Add Morphism not : not_ext.
-Red ; Intros.
-Apply H0.
-Inversion H.
-Apply (H3 H1).
-Qed.
-
-Definition fleche [A,B:Prop] := A -> B.
-
-Add Morphism fleche : fleche_ext.
-Unfold fleche.
-Intros.
-Inversion H0.
-Inversion H.
-Apply (H3 (H1 (H6 H2))).
-Qed.
-