diff -r f04b33ce250f -r a4dc62a46ee4 IOA/meta_theory/Option.thy
--- a/IOA/meta_theory/Option.thy	Tue Oct 24 14:59:17 1995 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,11 +0,0 @@
-(*  Title:      Option.thy
-    ID:         $Id$
-    Author:     Tobias Nipkow
-    Copyright   1994  TU Muenchen
-
-Datatype 'a option
-*)
-
-Option = Arith +
-datatype 'a option = None | Some('a)
-end