--- a/src/ZF/ex/NatSum.thy Sat Mar 13 16:37:15 2010 +0100
+++ b/src/ZF/ex/NatSum.thy Sat Mar 13 16:44:12 2010 +0100
@@ -1,5 +1,4 @@
(* Title: ZF/ex/Natsum.thy
- ID: $Id$
Author: Tobias Nipkow & Lawrence C Paulson
A summation operator. sum(f,n+1) is the sum of all f(i), i=0...n.