X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fdelayed_updating%2Fsubstitution%2Flift_path_length.ma;h=cd68cacb8342883151b8ebd5bb72c9b5717a6166;hb=7008128d354c6e998a87bc2febe9f86ea714869c;hp=f384cf7467621b88e03dceb0e9acdf6cea1b70d5;hpb=00fca351072c2dba11b71c14b1169d303fd6836f;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/delayed_updating/substitution/lift_path_length.ma b/matita/matita/contribs/lambdadelta/delayed_updating/substitution/lift_path_length.ma
index f384cf746..cd68cacb8 100644
--- a/matita/matita/contribs/lambdadelta/delayed_updating/substitution/lift_path_length.ma
+++ b/matita/matita/contribs/lambdadelta/delayed_updating/substitution/lift_path_length.ma
@@ -12,20 +12,21 @@
 (*                                                                        *)
 (**************************************************************************)
 
-include "delayed_updating/substitution/lift_eq.ma".
+include "delayed_updating/substitution/lift_path.ma".
 include "ground/lib/list_length.ma".
 
 (* LIFT FOR PATH ************************************************************)
 
 (* Constructions with list_length *******************************************)
 
-lemma lift_path_length (p) (f):
-      ❘p❘ = ❘↑[f]p❘.
-#p elim p -p // * [ #n ] #p #IH #f //
-[ <lift_path_m_sn
-| <lift_path_L_sn
-| <lift_path_A_sn
-| <lift_path_S_sn
+lemma lift_path_length (f) (p):
+      ❘p❘ = ❘🠡[f]p❘.
+#f #p elim p -p // * [ #k ] #p #IH
+[ <lift_path_d_dx
+| <lift_path_m_dx
+| <lift_path_L_dx
+| <lift_path_A_dx
+| <lift_path_S_dx
 ]
 >list_length_lcons >list_length_lcons //
 qed.