X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Fstatic%2Flsubd_lsubd.ma;h=270cdbd9defa357a6d62817f78cb30df1a0dbea2;hb=37e1b4f314ffae815beca71300688040f8da6939;hp=18670b4f1addac953987c491f8076291e977266f;hpb=c60524dec7ace912c416a90d6b926bee8553250b;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/basic_2/static/lsubd_lsubd.ma b/matita/matita/contribs/lambdadelta/basic_2/static/lsubd_lsubd.ma
index 18670b4f1..270cdbd9d 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/static/lsubd_lsubd.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/static/lsubd_lsubd.ma
@@ -23,7 +23,7 @@ theorem lsubd_trans: ∀h,g,G. Transitive … (lsubd h g G).
 [ #X #H >(lsubd_inv_atom1 … H) -H //
 | #I #L1 #L #Y #HL1 #IHL1 #X #H
   elim (lsubd_inv_pair1 … H) -H * #L2
-  [ #HL2 #H destruct /3 width=1/
+  [ #HL2 #H destruct /3 width=1 by lsubd_pair/
   | #W #V #d #HV #HW #HL2 #H1 #H2 #H3 destruct
     /3 width=3 by lsubd_beta, lsubd_da_trans/
   ]