X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fmatita%2Flibrary%2Fnat%2Ffactorial.ma;h=14217bbcbdee58a7dba618d68642da3eb315d37c;hb=4167cea65ca58897d1a3dbb81ff95de5074700cc;hp=22a799d07d33dade987df8242d1d7ba338442e54;hpb=fb94e5a71be508516514dfe50528ccfb3cd2da91;p=helm.git

diff --git a/helm/matita/library/nat/factorial.ma b/helm/matita/library/nat/factorial.ma
index 22a799d07..14217bbcb 100644
--- a/helm/matita/library/nat/factorial.ma
+++ b/helm/matita/library/nat/factorial.ma
@@ -52,10 +52,10 @@ intro.apply (nat_case n).intro.apply False_ind.apply (not_le_Sn_O (S(S O)) H).
 intros.change with ((S m) < (S m)*m!).
 apply (lt_to_le_to_lt ? ((S m)*(S (S O)))).
 rewrite < sym_times.
-simplify.
+simplify.unfold lt.
 apply le_S_S.rewrite < plus_n_O.
 apply le_plus_n.
 apply le_times_r.apply le_SSO_fact.
-simplify.apply le_S_S_to_le.exact H.
+simplify.unfold lt.apply le_S_S_to_le.exact H.
 qed.