X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fground%2Farith%2Fnat_minus.ma;h=d5d1c13fedc4c2aac683245bcf3ac0858a7da1b3;hb=55c768d7e45babb300b5010463ba3196a68f1bbe;hp=5d3726ca85c53b1dd16a30d5c7891079a3b51098;hpb=15212e44902f25536f6e2de4bec4cedcd9a9804d;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/ground/arith/nat_minus.ma b/matita/matita/contribs/lambdadelta/ground/arith/nat_minus.ma
index 5d3726ca8..d5d1c13fe 100644
--- a/matita/matita/contribs/lambdadelta/ground/arith/nat_minus.ma
+++ b/matita/matita/contribs/lambdadelta/ground/arith/nat_minus.ma
@@ -19,7 +19,7 @@ include "ground/arith/nat_pred_succ.ma".
 
 (*** minus *)
 definition nminus: nat → nat → nat ≝
-           λm,n. npred^n m.
+           λm,n. (npred^n) m.
 
 interpretation
   "minus (non-negative integers)"