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diff --git a/plugins/setoid_ring/Ring_equiv.v b/plugins/setoid_ring/Ring_equiv.v
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index 945f6c68..00000000
--- a/plugins/setoid_ring/Ring_equiv.v
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-Require Import Setoid_ring_theory.
-Require Import LegacyRing_theory.
-Require Import Ring_theory.
-
-Set Implicit Arguments.
-
-Section Old2New.
-
-Variable A : Type.
-
-Variable Aplus : A -> A -> A.
-Variable Amult : A -> A -> A.
-Variable Aone : A.
-Variable Azero : A.
-Variable Aopp : A -> A.
-Variable Aeq : A -> A -> bool.
-Variable R : Ring_Theory Aplus Amult Aone Azero Aopp Aeq.
-
-Let Aminus := fun x y => Aplus x (Aopp y).
-
-Lemma ring_equiv1 :
-  ring_theory Azero Aone Aplus Amult Aminus Aopp (eq (A:=A)).
-Proof.
-destruct R.
-split;  eauto.
-Qed.
-
-End Old2New.
-
-Section New2OldRing.
- Variable R : Type.
- Variable (rO rI : R) (radd rmul rsub: R->R->R) (ropp : R -> R).
- Variable Rth : ring_theory rO rI radd rmul rsub ropp (eq (A:=R)).
-
- Variable reqb : R -> R -> bool.
- Variable reqb_ok : forall x y, reqb x y = true -> x = y.
-
- Lemma ring_equiv2 :
-   Ring_Theory radd  rmul rI rO ropp reqb.
-Proof.
-elim Rth; intros; constructor;  eauto.
-intros.
-apply reqb_ok.
-destruct (reqb x y); trivial; intros.
-elim H.
-Qed.
-
- Definition default_eqb : R -> R -> bool := fun x y => false.
- Lemma default_eqb_ok : forall x y, default_eqb x y = true -> x = y.
-Proof.
-discriminate 1.
-Qed.
-
-End New2OldRing.
-
-Section New2OldSemiRing.
- Variable R : Type.
- Variable (rO rI : R) (radd rmul: R->R->R).
- Variable SRth : semi_ring_theory rO rI radd rmul (eq (A:=R)).
-
- Variable reqb : R -> R -> bool.
- Variable reqb_ok : forall x y, reqb x y = true -> x = y.
-
- Lemma sring_equiv2 :
-   Semi_Ring_Theory radd rmul rI rO reqb.
-Proof.
-elim SRth; intros; constructor;  eauto.
-intros.
-apply reqb_ok.
-destruct (reqb x y); trivial; intros.
-elim H.
-Qed.
-
-End New2OldSemiRing.