X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fmatita%2Flibrary%2Fnat%2Fnat.ma;h=b098279e62e9ed3ecf1cf99a04e564faaf3bbf2c;hb=10dbebadd2931de5b93871a6b4989e07f668e166;hp=c54b41c8d71e73262c949ea5043b6ddd2c4cc5d4;hpb=13c10bcf4c938ee43746bce6fb0e160b668e374d;p=helm.git

diff --git a/helm/software/matita/library/nat/nat.ma b/helm/software/matita/library/nat/nat.ma
index c54b41c8d..b098279e6 100644
--- a/helm/software/matita/library/nat/nat.ma
+++ b/helm/software/matita/library/nat/nat.ma
@@ -19,6 +19,7 @@ inductive nat : Set \def
   | S : nat \to nat.
 
 interpretation "Natural numbers" 'N = nat.
+alias num (instance 0) = "natural number".
 
 definition pred: nat \to nat \def
  \lambda n:nat. match n with