X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;ds=inline;f=helm%2Fmatita%2Flibrary%2Fnat.ma;h=4ab1feb2b84873e1898cc9e1c3ed68de98b9fe1e;hb=49734f6f824dd310520cbb0cee0e605296e2d975;hp=3ab39d9e485883e51868263d0b47c64cb42aebff;hpb=2133343c02507063421c4214029ac1eb585f389a;p=helm.git

diff --git a/helm/matita/library/nat.ma b/helm/matita/library/nat.ma
index 3ab39d9e4..4ab1feb2b 100644
--- a/helm/matita/library/nat.ma
+++ b/helm/matita/library/nat.ma
@@ -103,8 +103,8 @@ theorem times_n_Sm :
 \forall n,m:nat. eq nat (plus n (times n  m)) (times n (S m)).
 intros.elim n.simplify.reflexivity.
 simplify.apply f_equal.rewrite < H.
-transitivity (plus (plus e m) (times e m)).symmetry.
-apply assoc_plus.transitivity (plus (plus m e) (times e m)).
+transitivity (plus (plus e1 m) (times e1 m)).symmetry.
+apply assoc_plus.transitivity (plus (plus m e1) (times e1 m)).
 apply f_equal2.
 apply sym_plus.reflexivity.apply assoc_plus.
 qed.
@@ -188,7 +188,7 @@ qed.
 
 theorem le_Sn_n : \forall n:nat. Not (le (S n) n).
 intros.elim n.apply le_Sn_O.simplify.intros.
-cut le (S e) e.apply H.assumption.apply le_S_n.assumption.
+cut le (S e1) e1.apply H.assumption.apply le_S_n.assumption.
 qed.
 
 theorem le_antisym : \forall n,m:nat. (le n m) \to (le m n) \to (eq nat n m).