src/ZF/ex/BT.thy
changeset 935 a94ef3eed456
parent 753 ec86863e87c8
child 1171 e4d6b42be73a
--- a/src/ZF/ex/BT.thy	Tue Mar 07 13:34:33 1995 +0100
+++ b/src/ZF/ex/BT.thy	Tue Mar 07 13:37:48 1995 +0100
@@ -6,7 +6,7 @@
 Binary trees
 *)
 
-BT = Univ +
+BT = Datatype +
 consts
     bt_rec    	:: "[i, i, [i,i,i,i,i]=>i] => i"
     n_nodes	:: "i=>i"