X-Git-Url: http://matita.cs.unibo.it/gitweb/?p=helm.git;a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Frt_transition%2Fcnx_basic.ma;h=41cb6dad884cb758007a1bf1b5f6e2c7a8219fa8;hp=4f07b3e5e3cce58c1186aeb8dd42c130d13c61dc;hb=bd53c4e895203eb049e75434f638f26b5a161a2b;hpb=3b7b8afcb429a60d716d5226a5b6ab0d003228b1

diff --git a/matita/matita/contribs/lambdadelta/basic_2/rt_transition/cnx_basic.ma b/matita/matita/contribs/lambdadelta/basic_2/rt_transition/cnx_basic.ma
index 4f07b3e5e..41cb6dad8 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/rt_transition/cnx_basic.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/rt_transition/cnx_basic.ma
@@ -20,7 +20,7 @@ include "basic_2/rt_transition/cnx.ma".
 
 (* Advanced inversion lemmas ************************************************)
 
-lemma cnx_inv_abbr_pos (h) (G) (L): ∀V,T.  ⦃G,L⦄ ⊢ ⬈[h] 𝐍⦃+ⓓV.T⦄ → ⊥.
+lemma cnx_inv_abbr_pos (h) (G) (L): ∀V,T.  ❪G,L❫ ⊢ ⬈[h] 𝐍❪+ⓓV.T❫ → ⊥.
 #h #G #L #V #U1 #H
 elim (cpx_subst h G (L.ⓓV) U1 … 0) [|*: /2 width=4 by drops_refl/ ] #U2 #T2 #HU12 #HTU2
 elim (teqx_dec U1 U2) #HnU12 [ -HU12 | -HTU2 ]