X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fmatita%2Flibrary%2Fnat%2Fnat.ma;h=c54b41c8d71e73262c949ea5043b6ddd2c4cc5d4;hb=13c10bcf4c938ee43746bce6fb0e160b668e374d;hp=9fce4df76a8b3dfbd7071582202ea648676d884b;hpb=2a2ecad1d946365ccdf182d00480605b3497e7f5;p=helm.git

diff --git a/helm/software/matita/library/nat/nat.ma b/helm/software/matita/library/nat/nat.ma
index 9fce4df76..c54b41c8d 100644
--- a/helm/software/matita/library/nat/nat.ma
+++ b/helm/software/matita/library/nat/nat.ma
@@ -18,6 +18,8 @@ inductive nat : Set \def
   | O : nat
   | S : nat \to nat.
 
+interpretation "Natural numbers" 'N = nat.
+
 definition pred: nat \to nat \def
  \lambda n:nat. match n with
  [ O \Rightarrow  O