update in groud_2 and models

[helm.git] / helm / software / matita / nlibrary / basics / list.ma

diff --git a/helm/software/matita/nlibrary/basics/list.ma b/helm/software/matita/nlibrary/basics/list.ma
index 3d41b946c73a7929a227c529ab313f7d3a273c8e..94ef847b00c4aa70ba0ed10f5b97b8d6c3146082 100644 (file)
--- a/helm/software/matita/nlibrary/basics/list.ma
+++ b/helm/software/matita/nlibrary/basics/list.ma
@@ -80,7 +80,7 @@ ntheorem cons_append_commute:
 //; nqed. *)
 
 ntheorem append_cons:∀A.∀a:A.∀l,l1.l@(a::l1)=(l@[a])@l1.
-#A; #a; #l; #l1; napply symmetric_eq.
+#A; #a; #l; #l1; napply sym_eq.
 napply associative_append.
 (* /2/; *) nqed.