-(* adds a symmetry step *)
-let symmetric pred eq eq_ty l id uri m =
- let pred =
- Cic.Lambda (Cic.Name "Sym",eq_ty,
- Cic.Appl [CicSubstitution.lift 1 eq ;
- CicSubstitution.lift 1 eq_ty;
- Cic.Rel 1;CicSubstitution.lift 1 l])
- in
- let prefl =
- Equality.Exact (Cic.Appl
- [Cic.MutConstruct(uri,0,1,[]);eq_ty;l])
- in
- let id1 =
- let eq = Equality.mk_equality (0,prefl,(eq_ty,l,l,Eq),m) in
- let (_,_,_,_,id) = Equality.open_equality eq in
- id
- in
- Equality.Step(Subst.empty_subst,
- (Equality.Demodulation,id1,(Utils.Left,id),pred))
-;;
-