X-Git-Url: http://matita.cs.unibo.it/gitweb/?p=helm.git;a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fground%2Farith%2Fnat_le_plus.ma;h=7a53e23f745851ddc67afeab505582aa40f4592e;hp=d54738f250b4100fea5bbdde0c20518572aad361;hb=8fdf1af656038d0245eba64ff2531bbe94ce0e9e;hpb=77c9255de3c5f7780aeacd745703a1cc76328a68

diff --git a/matita/matita/contribs/lambdadelta/ground/arith/nat_le_plus.ma b/matita/matita/contribs/lambdadelta/ground/arith/nat_le_plus.ma
index d54738f25..7a53e23f7 100644
--- a/matita/matita/contribs/lambdadelta/ground/arith/nat_le_plus.ma
+++ b/matita/matita/contribs/lambdadelta/ground/arith/nat_le_plus.ma
@@ -39,7 +39,11 @@ lemma nle_plus_dx_sn_refl (m) (n): m ≤ n + m.
 /2 width=1 by nle_plus_bi_sn/ qed.
 
 (*** le_plus_a *)
-lemma nle_plus_dx_sn (m) (n) (o): n ≤ m → n ≤ o + m.
+lemma nle_plus_dx_sn (o) (m) (n): n ≤ m → n ≤ o + m.
+/2 width=3 by nle_trans/ qed.
+
+(*** le_plus_b *)
+lemma nle_plus_dx_dx (o) (m) (n): n ≤ m → n ≤ m + o.
 /2 width=3 by nle_trans/ qed.
 
 (* Main constructions with nplus ********************************************)