X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Fstatic%2Flsubr_length.ma;h=db04cd8fac35b21ace48a49f7ffeb11b9bae47c4;hb=98fbba1b68d457807c73ebf70eb2a48696381da4;hp=9c6beef120bd08f226502783f89e77affc48c81c;hpb=65e6209e0758832835ba8d14304a1548d059a634;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/basic_2/static/lsubr_length.ma b/matita/matita/contribs/lambdadelta/basic_2/static/lsubr_length.ma
index 9c6beef12..db04cd8fa 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/static/lsubr_length.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/static/lsubr_length.ma
@@ -19,6 +19,6 @@ include "basic_2/static/lsubr.ma".
 
 (* Forward lemmas with length for local environments ************************)
 
-lemma lsubr_fwd_length: ∀L1,L2. L1 ⫃ L2 → |L2| ≤ |L1|.
-#L1 #L2 #H elim H -L1 -L2 /2 width=1 by O, le_S_S/
+lemma lsubr_fwd_length: ∀L1,L2. L1 ⫃ L2 → |L2| = |L1|.
+#L1 #L2 #H elim H -L1 -L2 normalize //
 qed-.