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 "Basic_2/unfold/tpss.ma".
17 (* DELIFT ON TERMS **********************************************************)
19 definition delift: nat → nat → lenv → relation term ≝
20 λd,e,L,T1,T2. ∃∃T. L ⊢ T1 [d, e] ≫* T & ↑[d, e] T2 ≡ T.
22 interpretation "delift (term)"
23 'TSubst L T1 d e T2 = (delift d e L T1 T2).