src/ZF/ex/BT.thy
changeset 935 a94ef3eed456
parent 753 ec86863e87c8
child 1171 e4d6b42be73a
     1.1 --- a/src/ZF/ex/BT.thy	Tue Mar 07 13:34:33 1995 +0100
     1.2 +++ b/src/ZF/ex/BT.thy	Tue Mar 07 13:37:48 1995 +0100
     1.3 @@ -6,7 +6,7 @@
     1.4  Binary trees
     1.5  *)
     1.6  
     1.7 -BT = Univ +
     1.8 +BT = Datatype +
     1.9  consts
    1.10      bt_rec    	:: "[i, i, [i,i,i,i,i]=>i] => i"
    1.11      n_nodes	:: "i=>i"