X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fstatic_2%2Fstatic%2Freq_drops.ma;h=fa8ea6d8441c5c048f88ed74cb0ba0af238f50f7;hb=bd53c4e895203eb049e75434f638f26b5a161a2b;hp=76f25cd40ee8ee92b8fa7d0bfdd959a66f12e2f7;hpb=f308429a0fde273605a2330efc63268b4ac36c99;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/static_2/static/req_drops.ma b/matita/matita/contribs/lambdadelta/static_2/static/req_drops.ma
index 76f25cd40..fa8ea6d84 100644
--- a/matita/matita/contribs/lambdadelta/static_2/static/req_drops.ma
+++ b/matita/matita/contribs/lambdadelta/static_2/static/req_drops.ma
@@ -20,7 +20,7 @@ include "static_2/static/req.ma".
 (* Note: req_inv_lifts_dx missing in basic_2A1 *)
 
 (* Basic_2A1: uses: lleq_inv_lift_le lleq_inv_lift_be lleq_inv_lift_ge *)
-lemma req_inv_lifts_bi: ∀L1,L2,U. L1 ≡[U] L2 → ∀b,f. 𝐔⦃f⦄ →
-                        ∀K1,K2. ⬇*[b,f] L1 ≘ K1 → ⬇*[b,f] L2 ≘ K2 →
-                        ∀T. ⬆*[f] T ≘ U → K1 ≡[T] K2.
+lemma req_inv_lifts_bi: ∀L1,L2,U. L1 ≡[U] L2 → ∀b,f. 𝐔❪f❫ →
+                        ∀K1,K2. ⇩*[b,f] L1 ≘ K1 → ⇩*[b,f] L2 ≘ K2 →
+                        ∀T. ⇧*[f] T ≘ U → K1 ≡[T] K2.
 /2 width=10 by rex_inv_lifts_bi/ qed-.