X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fground%2Farith%2Fnat_minus_plus.ma;fp=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fground%2Farith%2Fnat_minus_plus.ma;h=ecda40f03cc32b1ca32e434d09e1f036fbf1137b;hb=888840f6b3a71d3d686b53b702d362ab90ab0038;hp=bb8c911bc91b92b14eade2599003dda8ced21d7b;hpb=19b0a814861157ba05f23877d5cd94059f52c2e8;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/ground/arith/nat_minus_plus.ma b/matita/matita/contribs/lambdadelta/ground/arith/nat_minus_plus.ma
index bb8c911bc..ecda40f03 100644
--- a/matita/matita/contribs/lambdadelta/ground/arith/nat_minus_plus.ma
+++ b/matita/matita/contribs/lambdadelta/ground/arith/nat_minus_plus.ma
@@ -34,7 +34,7 @@ qed.
 theorem nminus_plus_assoc (o) (m) (n): o-m-n = o-(m+n).
 #o #m #n @(nat_ind_succ … n) -n //
 #n #IH <nplus_succ_dx <nminus_succ_dx <nminus_succ_dx //
-qed-.
+qed.
 
 (*** minus_plus_plus_l *)
 lemma nminus_plus_dx_bi (m) (n) (o): m - n = (m + o) - (n + o).