+++ /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 "basic_2/static/frees_lreq.ma".
-include "basic_2/static/lfeq.ma".
-
-(* EQUIVALENCE FOR LOCAL ENVIRONMENTS ON REFERRED ENTRIES *******************)
-
-(* Inversion lemmas with ranged equivalence for local environments **********)
-
-lemma lfeq_inv_lreq: ∀L1,L2,T. L1 ≡[T] L2 → ∃∃f. L1 ⊢ 𝐅*⦃T⦄ ≡ f & L1 ≡[f] L2.
-#L1 #L2 #T * /2 width=3 by ex2_intro/
-qed-.
-
-(* Properties with ranged equivalence for local environments ****************)
-
-lemma lreq_lfeq: ∀f,L1,L2,T. L1 ⊢ 𝐅*⦃T⦄ ≡ f → L1 ≡[f] L2 → L1 ≡[T] L2.
-/2 width=3 by ex2_intro/ qed.
-
-(* Advanced properties ******************************************************)
-
-lemma lfeq_sym: ∀T. symmetric … (lfeq T).
-#T #L1 #L2 #H elim (lfeq_inv_lreq … H) -H
-/3 width=3 by lreq_lfeq, frees_lreq_conf, lreq_sym/
-qed-.