X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fmatita%2Fcontribs%2Fdama%2Fdama%2Fproperty_sigma.ma;h=67209928116df8aec54e7a70e5304a0011d257e1;hb=ada8695ba51b2ecbd4a955f990e8d06f038aac6b;hp=ba90bb0ab50097e864bdf9c884902aa049098c44;hpb=cb2419357a3f80388f71eb2730bff154bd4ef000;p=helm.git

diff --git a/helm/software/matita/contribs/dama/dama/property_sigma.ma b/helm/software/matita/contribs/dama/dama/property_sigma.ma
index ba90bb0ab..672099281 100644
--- a/helm/software/matita/contribs/dama/dama/property_sigma.ma
+++ b/helm/software/matita/contribs/dama/dama/property_sigma.ma
@@ -77,9 +77,8 @@ letin m ≝ (hide ? (let rec aux (i:nat) : nat ≝
       intros; lapply (H5 i j) as H14;
         [2: apply (max_le_l ??? H6);|3:apply (max_le_l ??? H7);]
       cases (le_to_or_lt_eq ?? H10); [2: destruct H11; destruct H4; assumption]
-      generalize in match H6; generalize in match H7;
-      cases (aux n1); simplify in ⊢ (? (? ? %) ?→? (? ? %) ?→?); intros;
-      apply H12; [3: apply le_S_S_to_le; assumption]
+      cases (aux n1) in H6 H7 ⊢ %; simplify in ⊢ (? (? ? %) ?→? (? ? %) ?→?); intros;
+      apply H6; [3: apply le_S_S_to_le; assumption]
       apply lt_to_le; apply (max_le_r w1); assumption;
   |4: intros; clear H6; rewrite > H4 in H5; 
       rewrite < (le_n_O_to_eq ? H11); apply H5; assumption;]