update in delayed_updating

[helm.git] / matita / matita / contribs / lambdadelta / delayed_updating / substitution / lift_path_length.ma

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 635a13e1db8174be04c1a63d7aa780d50d8c546e..cd68cacb8342883151b8ebd5bb72c9b5717a6166 100644 (file)
--- a/matita/matita/contribs/lambdadelta/delayed_updating/substitution/lift_path_length.ma
+++ b/matita/matita/contribs/lambdadelta/delayed_updating/substitution/lift_path_length.ma
@@ -20,7 +20,7 @@ include "ground/lib/list_length.ma".
 (* Constructions with list_length *******************************************)
 
 lemma lift_path_length (f) (p):
-      ❘p❘ = ❘↑[f]p❘.
+      ❘p❘ = ❘🠡[f]p❘.
 #f #p elim p -p // * [ #k ] #p #IH
 [ <lift_path_d_dx
 | <lift_path_m_dx