From: Claudio Sacerdoti Coen <claudio.sacerdoticoen@unibo.it>
Date: Wed, 30 Dec 2009 17:31:18 +0000 (+0000)
Subject: Removed line is back again.
X-Git-Tag: make_still_working~3157
X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=commitdiff_plain;h=cb7f8dd59d9b6d60671b634156ca410c737ff218;p=helm.git

Removed line is back again.
---

diff --git a/helm/software/matita/nlibrary/nat/nat.ma b/helm/software/matita/nlibrary/nat/nat.ma
index eed1efd1c..e9d32973b 100644
--- a/helm/software/matita/nlibrary/nat/nat.ma
+++ b/helm/software/matita/nlibrary/nat/nat.ma
@@ -14,6 +14,7 @@
 
 include "hints_declaration.ma".
 include "logic/equality.ma".
+include "sets/setoids.ma".
 
 ninductive nat: Type[0] ≝
    O: nat