X-Git-Url: http://matita.cs.unibo.it/gitweb/?p=helm.git;a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Frt_computation%2Fcprs_tweq.ma;h=14503c1ecd24073c6d74e5e01dec52e09f296573;hp=7c8102af237cc09551a831b73837086cbd0ca5e9;hb=bd53c4e895203eb049e75434f638f26b5a161a2b;hpb=3b7b8afcb429a60d716d5226a5b6ab0d003228b1

diff --git a/matita/matita/contribs/lambdadelta/basic_2/rt_computation/cprs_tweq.ma b/matita/matita/contribs/lambdadelta/basic_2/rt_computation/cprs_tweq.ma
index 7c8102af2..14503c1ec 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/rt_computation/cprs_tweq.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/rt_computation/cprs_tweq.ma
@@ -22,7 +22,7 @@ include "basic_2/rt_computation/cpms.ma".
 (* Properties with sort-irrelevant whd equivalence on terms *****************)
 
 lemma cprs_abbr_pos_twneq (h) (G) (L) (V) (T1):
-      ∃∃T2. ⦃G,L⦄ ⊢ +ⓓV.T1 ➡*[h] T2 & (+ⓓV.T1 ≅ T2 → ⊥).
+      ∃∃T2. ❪G,L❫ ⊢ +ⓓV.T1 ➡*[h] T2 & (+ⓓV.T1 ≅ T2 → ⊥).
 #h #G #L #V #U1
 elim (cpr_subst h G (L.ⓓV) U1 … 0) [|*: /2 width=4 by drops_refl/ ] #U2 #T2 #HU12 #HTU2
 elim (tweq_dec U1 U2) [ #HpU12 | -HTU2 #HnU12 ]