--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/CCL/Gfp.thy	Thu Sep 16 12:20:38 1993 +0200
@@ -0,0 +1,14 @@
+(*  Title: 	HOL/gfp.thy
+    ID:         $Id$
+    Author: 	Lawrence C Paulson, Cambridge University Computer Laboratory
+    Copyright   1992  University of Cambridge
+
+Greatest fixed points
+*)
+
+Gfp = Lfp +
+consts gfp :: "['a set=>'a set] => 'a set"
+rules
+ (*greatest fixed point*)
+ gfp_def "gfp(f) == Union({u. u <= f(u)})"
+end