+++ /dev/null
-(**************************************************************************)
-(* ___ *)
-(* ||M|| *)
-(* ||A|| A project by Andrea Asperti *)
-(* ||T|| *)
-(* ||I|| Developers: *)
-(* ||T|| The HELM team. *)
-(* ||A|| http://helm.cs.unibo.it *)
-(* \ / *)
-(* \ / This file is distributed under the terms of the *)
-(* v GNU General Public License Version 2 *)
-(* *)
-(**************************************************************************)
-
-include "alpha_1/syntax/term.ma".
-
-(* TERMS ********************************************************************)
-
-let rec tappend T U on T ≝ match T with
-[ TAtom ⇒ U
-| TUnit I T ⇒ ①[I].(tappend T U)
-| TPair I V T ⇒ ②[I]V.(tappend T U)
-].
-
-interpretation "append (term)" 'plus T U = (tappend T U).