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 "static_2/static/req_fsle.ma".
16 include "static_2/static/reqx.ma".
18 (* SORT-IRRELEVANT EQUIVALENCE FOR LOCAL ENVIRONMENTS ON REFERRED ENTRIES ***)
20 (* Properties with syntactic equivalence on referred entries ****************)
22 lemma req_reqx: ∀L1,L2. ∀T:term. L1 ≡[T] L2 → L1 ≛[T] L2.
23 /2 width=3 by rex_co/ qed.
25 lemma req_reqx_trans: ∀L1,L. ∀T:term. L1 ≡[T] L →
26 ∀L2. L ≛[T] L2 → L1 ≛[T] L2.
27 /2 width=3 by req_rex_trans/ qed-.