diff -r 7e38237edfcb -r 8c3190b173aa src/HOLCF/Porder0.thy
--- a/src/HOLCF/Porder0.thy	Thu Sep 30 10:06:56 1999 +0200
+++ b/src/HOLCF/Porder0.thy	Thu Sep 30 16:16:56 1999 +0200
@@ -7,7 +7,7 @@
 
 *)
 
-Porder0 = Arith +
+Porder0 = Main +
 
 	(* introduce a (syntactic) class for the constant << *)
 axclass sq_ord<term