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/ldrops_ldrop.ma".
17 (* GENERIC LOCAL ENVIRONMENT SLICING ****************************************)
19 (* Main properties **********************************************************)
21 (* Basic_1: was: drop1_trans *)
22 theorem ldrops_trans: ∀L,L2,des2. ⇩*[des2] L ≡ L2 → ∀L1,des1. ⇩*[des1] L1 ≡ L →
23 ⇩*[des2 @ des1] L1 ≡ L2.
24 #L #L2 #des2 #H elim H -L -L2 -des2 // /3 width=3/