X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fmatita%2Flibrary%2FZ%2Fz.ma;h=31c3a7003bdffca309780ce3e38122712efe4368;hb=070b44c9c2344967ca8c4531909614a0d4da2fbe;hp=d598b7de87e7268594ea5ab0fdd2f63dd6f9155b;hpb=ca41435a6021292ccba239aa173651c0be705b45;p=helm.git

diff --git a/helm/software/matita/library/Z/z.ma b/helm/software/matita/library/Z/z.ma
index d598b7de8..31c3a7003 100644
--- a/helm/software/matita/library/Z/z.ma
+++ b/helm/software/matita/library/Z/z.ma
@@ -20,6 +20,8 @@ inductive Z : Set \def
 | pos : nat \to Z
 | neg : nat \to Z.
 
+interpretation "Integers" 'Z = Z.
+
 definition Z_of_nat \def
 \lambda n. match n with
 [ O \Rightarrow  OZ