X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;ds=sidebyside;f=helm%2Focaml%2Fcic_proof_checking%2FcicSubstitution.mli;h=5c8fa7ca59b8e31bc3019f71ef0a3cbd91ac0354;hb=47c9a0967ce271e551d4cbc8ac388097d774a3ef;hp=2032869911d35fa6154298b7c1bb10d1fa77dff0;hpb=9ea87248101d774e1b4c4b706d8d99444b2e5907;p=helm.git

diff --git a/helm/ocaml/cic_proof_checking/cicSubstitution.mli b/helm/ocaml/cic_proof_checking/cicSubstitution.mli
index 203286991..5c8fa7ca5 100644
--- a/helm/ocaml/cic_proof_checking/cicSubstitution.mli
+++ b/helm/ocaml/cic_proof_checking/cicSubstitution.mli
@@ -28,11 +28,22 @@ exception RelToHiddenHypothesis;;
 exception ReferenceToVariable;;
 exception ReferenceToConstant;;
 exception ReferenceToInductiveDefinition;;
+exception DeliftingWouldCaptureAFreeVariable;;
 
 (* lift n t         *)
 (* lifts [t] of [n] *)
 val lift : int -> Cic.term -> Cic.term
 
+(** delifts t of n
+ *  @raise Failure s
+ *)
+val delift : int -> Cic.term -> Cic.term
+ 
+
+(* lift from n t *)
+(* as lift but lifts only indexes >= from *)
+val lift_from: int -> int -> Cic.term -> Cic.term
+
 (* subst t1 t2                          *)
 (* substitutes [t1] for [Rel 1] in [t2] *)
 val subst : Cic.term -> Cic.term -> Cic.term
@@ -42,7 +53,8 @@ val subst : Cic.term -> Cic.term -> Cic.term
 val subst_vars :
  Cic.term Cic.explicit_named_substitution -> Cic.term -> Cic.term
 
-(* lift_meta [t_1 ; ... ; t_n] t                                *)
+(* subst_meta [t_1 ; ... ; t_n] t                                *)
 (* returns the term [t] where [Rel i] is substituted with [t_i] *)
 (* [t_i] is lifted as usual when it crosses an abstraction      *)
-val lift_meta : (Cic.term option) list -> Cic.term -> Cic.term
+val subst_meta : (Cic.term option) list -> Cic.term -> Cic.term
+