--- a/Nominal/Ex/Sigma.thy	Tue Feb 19 05:38:46 2013 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,20 +0,0 @@
-theory Sigma
-imports Nominal2
-begin
-
-atom_decl name
-
-nominal_datatype obj =
-  Var name
-| Obj smlst
-| Inv obj string
-| Upd obj string method
-and smlst =
-  SMNil
-| SMCons string method smlst
-and method =
-  Sig n::name o::obj binds n in o
-
-
-end
-