X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fmatita%2Flibrary%2Fnat%2Fnat.ma;h=83b489f06eb08a6772e0d7abb00e315032604ad0;hb=e880d6eab5e1700f4a625ddcd7d0fa8f0cce2dcc;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..83b489f06 100644
--- a/helm/software/matita/library/nat/nat.ma
+++ b/helm/software/matita/library/nat/nat.ma
@@ -1,5 +1,5 @@
 (**************************************************************************)
-(*       ___	                                                              *)
+(*       ___	                                                          *)
 (*      ||M||                                                             *)
 (*      ||A||       A project by Andrea Asperti                           *)
 (*      ||T||                                                             *)
@@ -20,6 +20,10 @@ inductive nat : Set \def
 
 interpretation "Natural numbers" 'N = nat.
 
+default "natural numbers" cic:/matita/nat/nat/nat.ind.
+
+alias num (instance 0) = "natural number".
+
 definition pred: nat \to nat \def
  \lambda n:nat. match n with
  [ O \Rightarrow  O