X-Git-Url: http://matita.cs.unibo.it/gitweb/?p=helm.git;a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2A%2Fmultiple%2Fdrops_drop.ma;h=2502ebc9e70f2039ba16b31e1f99f96933ddee5a;hp=2e938ac75c4823506562dbe3b66e75b3f302923b;hb=1fd63df4c77f5c24024769432ea8492748b4ac79;hpb=277fc8ff21ce3dbd6893b1994c55cf5c06a98355

diff --git a/matita/matita/contribs/lambdadelta/basic_2A/multiple/drops_drop.ma b/matita/matita/contribs/lambdadelta/basic_2A/multiple/drops_drop.ma
index 2e938ac75..2502ebc9e 100644
--- a/matita/matita/contribs/lambdadelta/basic_2A/multiple/drops_drop.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2A/multiple/drops_drop.ma
@@ -21,7 +21,7 @@ include "basic_2A/multiple/drops.ma".
 
 lemma drops_drop_trans: ∀L1,L,cs. ⬇*[Ⓕ, cs] L1 ≡ L → ∀L2,i. ⬇[i] L ≡ L2 →
                         ∃∃L0,cs0,i0. ⬇[i0] L1 ≡ L0 & ⬇*[Ⓕ, cs0] L0 ≡ L2 &
-                                      @⦃i, cs⦄ ≡ i0 & cs ▭ i ≡ cs0.
+                                      @❪i, cs❫ ≘ i0 & cs ▭ i ≘ cs0.
 #L1 #L #cs #H elim H -L1 -L -cs
 [ /2 width=7 by drops_nil, minuss_nil, at_nil, ex4_3_intro/
 | #L1 #L0 #L #cs #l #m #_ #HL0 #IHL0 #L2 #i #HL2