X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Frt_transition%2Frpx_drops.ma;h=ae9319282a50898c99146529f8c8a711c777e169;hb=bd53c4e895203eb049e75434f638f26b5a161a2b;hp=eaf81190d77217ce6bc0422952c171a73de348b1;hpb=0af3592e3a85a4bb82c5c6df259cf9ab117ba0b1;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/basic_2/rt_transition/rpx_drops.ma b/matita/matita/contribs/lambdadelta/basic_2/rt_transition/rpx_drops.ma
index eaf81190d..ae9319282 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/rt_transition/rpx_drops.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/rt_transition/rpx_drops.ma
@@ -32,7 +32,7 @@ lemma rpx_inv_lifts_dx (h) (G): f_dropable_dx (cpx h G).
 /2 width=5 by rex_dropable_dx/ qed-.
 
 lemma rpx_inv_lifts_bi (h) (G):
-                       ∀L1,L2,U. ⦃G,L1⦄ ⊢ ⬈[h,U] L2 → ∀b,f. 𝐔⦃f⦄ →
+                       ∀L1,L2,U. ❪G,L1❫ ⊢ ⬈[h,U] L2 → ∀b,f. 𝐔❪f❫ →
                        ∀K1,K2. ⇩*[b,f] L1 ≘ K1 → ⇩*[b,f] L2 ≘ K2 →
-                       ∀T. ⇧*[f]T ≘ U → ⦃G,K1⦄ ⊢ ⬈[h,T] K2.
+                       ∀T. ⇧*[f]T ≘ U → ❪G,K1❫ ⊢ ⬈[h,T] K2.
 /2 width=10 by rex_inv_lifts_bi/ qed-.