diff -r f04b33ce250f -r a4dc62a46ee4 Subst/Setplus.thy
--- a/Subst/Setplus.thy	Tue Oct 24 14:59:17 1995 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,14 +0,0 @@
-(*  Title: 	Substitutions/setplus.thy
-    Author: 	Martin Coen, Cambridge University Computer Laboratory
-    Copyright   1993  University of Cambridge
-
-Minor additions to HOL's set theory
-*)
-
-Setplus = Set + 
-
-rules
-
-  ssubset_def    "A < B == A <= B & ~ A=B"
-
-end