From: Andrea Asperti <andrea.asperti@unibo.it>
Date: Wed, 2 Nov 2011 10:58:34 +0000 (+0000)
Subject: The proof of append_cons used transitive_eq, not indexed.
X-Git-Tag: make_still_working~2144
X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=commitdiff_plain;h=cb4b0c887ba703b7949656d5b72b5f94756a77bd;p=helm.git

The proof of append_cons used transitive_eq, not indexed.
If other cases will present we shall reindex it.
---

diff --git a/matita/matita/lib/basics/list.ma b/matita/matita/lib/basics/list.ma
index 8b0449987..eaf89510a 100644
--- a/matita/matita/lib/basics/list.ma
+++ b/matita/matita/lib/basics/list.ma
@@ -72,7 +72,7 @@ ntheorem cons_append_commute:
 //; nqed. *)
 
 theorem append_cons:∀A.∀a:A.∀l,l1.l@(a::l1)=(l@[a])@l1.
-/2/ qed.
+#A #a #l #l1 >associative_append // qed.
 
 theorem nil_append_elim: ∀A.∀l1,l2: list A.∀P:?→?→Prop. 
   l1@l2=[] → P (nil A) (nil A) → P l1 l2.