diff -r dc6be28d7f4e -r c69542757a4d src/HOL/Nat.thy
--- a/src/HOL/Nat.thy	Mon Aug 16 14:21:54 2004 +0200
+++ b/src/HOL/Nat.thy	Mon Aug 16 14:22:27 2004 +0200
@@ -8,7 +8,9 @@
 
 header {* Natural numbers *}
 
-theory Nat = Wellfounded_Recursion + Ring_and_Field:
+theory Nat
+import Wellfounded_Recursion Ring_and_Field
+begin
 
 subsection {* Type @{text ind} *}