diff -r 428efffe8599 -r b50b8c0eec01 src/ZF/WF.thy
--- a/src/ZF/WF.thy	Fri Jan 03 10:48:28 1997 +0100
+++ b/src/ZF/WF.thy	Fri Jan 03 15:01:55 1997 +0100
@@ -6,7 +6,7 @@
 Well-founded Recursion
 *)
 
-WF = Trancl + "mono" + "equalities" +
+WF = Trancl + mono + equalities +
 consts
   wf           :: i=>o
   wf_on        :: [i,i]=>o                      ("wf[_]'(_')")