src/ZF/Arith.thy

--- a/src/ZF/Arith.thy	Sat Mar 13 16:37:15 2010 +0100
+++ b/src/ZF/Arith.thy	Sat Mar 13 16:44:12 2010 +0100
@@ -1,8 +1,6 @@
 (*  Title:      ZF/Arith.thy
-    ID:         $Id$
     Author:     Lawrence C Paulson, Cambridge University Computer Laboratory
     Copyright   1992  University of Cambridge
-
 *)
 
 (*"Difference" is subtraction of natural numbers.