1 (**************************************************************************)
4 (* ||A|| A project by Andrea Asperti *)
6 (* ||I|| Developers: *)
7 (* ||T|| The HELM team. *)
8 (* ||A|| http://helm.cs.unibo.it *)
10 (* \ / This file is distributed under the terms of the *)
11 (* v GNU General Public License Version 2 *)
13 (**************************************************************************)
15 include "alpha_1/grammar/term.ma".
17 (* TERMS ********************************************************************)
19 let rec tappend T U on T ≝ match T with
21 | TUnit I T ⇒ ①{I}.(tappend T U)
22 | TPair I V T ⇒ ②{I}V.(tappend T U)
25 interpretation "append (term)" 'Append T U = (tappend T U).