Definition EqPredType_trans r2 r1 r3 := @EqPredType_trans' r1 r2 r3.Definition SubPredType_trans r2 r1 r3 := @SubPredType_trans' r1 r2 r3.(* Declaration of relations *)

Add Parametric Relation T (pT : PredType T) : pT (@EqPredType _ pT)    
   reflexivity proved by (@EqPredType_refl _ _)                         
  symmetry proved by (@EqPredType_sym _ _)                              
  transitivity proved by (@EqPredType_trans' _ _) as EqPredType_rel.Add Parametric Relation T : (Simpl_Pred T) (@EqSimplPred _)
  reflexivity proved by (@EqPredType_refl _ _)
  symmetry proved by (@EqPredType_sym _ _)
  transitivity proved by (@EqPredType_trans' _ _) as EqSimplPred_rel.Add Parametric Relation T : (Simpl_Pred T) (@SubSimplPred _) 
  reflexivity proved by (@SubPredType_refl _ _)
  transitivity proved by (@SubPredType_trans' _ _) as SubSimplPred_rel.Add Parametric Relation T : (Mem_Pred T) (@EqMem T)
  reflexivity proved by (@EqPredType_refl _ _)
  symmetry proved by (@EqPredType_sym _ _)
  transitivity proved by (@EqPredType_trans' _ _) as EqMem_rel.Add Parametric Relation T : (Mem_Pred T) (@SubMem _) 
  reflexivity proved by (@SubPredType_refl _ _)
  transitivity proved by (@SubPredType_trans' _ _) as SubMem_rel.(* Declaring morphisms. *)

Add Parametric Morphism T : (@Pred_of_Simpl T) with signature
      @EqSimplPred _ ==> @EqPredType T (PredPredType T) as Pred_of_Simpl_morph.Add Parametric Morphism T (pT : PredType T) : (@EqPredType T pT) with signature 
    @EqPredType _ _ ==> @EqPredType _ _ ==> iff as EqPredType_morph.Add Parametric Morphism T (pT : PredType T) : (@SubPredType T pT) with signature
    @EqPredType _ _ ==> @EqPredType _ _ ==> iff as SubPred_morph.Add Parametric Morphism T : (@InMem T) with signature 
    @eq _ ==> @EqMem _ ==> iff as InMem_morph.Add Parametric Morphism T (pT : PredType T) : (@Mem T pT) with signature
  @EqPredType _ _ ==> @EqMem _ as Mem_morhp.Add Parametric Morphism T : (@PredU T) with signature 
    @EqPredType _ _ ==> @EqPredType _ _ ==> @EqSimplPred _ as predU_morph.Add Parametric Morphism T : (@PredI T) with signature 
    @EqPredType _ _ ==> @EqPredType _ _ ==> @EqPredType _ _ as predI_morph.Add Parametric Morphism T : (@PredC T) with signature 
    @EqPredType _ _ ==> @EqPredType _ _ as predC_morph.

Lemma orrAC (r1 r2 r3 : Pred T) : (r1 +p r2) +p r3 <~> (r1 +p r3) +p r2.