--- a/Nominal/FSet.thy Fri Jun 11 16:36:02 2010 +0200
+++ b/Nominal/FSet.thy Fri Jun 11 17:52:06 2010 +0200
@@ -603,6 +603,8 @@
is
"concat"
+thm fconcat_def
+
quotient_definition
"ffilter :: ('a \<Rightarrow> bool) \<Rightarrow> 'a fset \<Rightarrow> 'a fset"
is