X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fmatita%2Fnlibrary%2Fnat%2Fnat.ma;h=eed1efd1c83a907ed4c247e65d1a2ab9608fcd2a;hb=a90c31c1b53222bd6d57360c5ba5c2d0fe7d5207;hp=e9d32973bdb02a10caba88490cd84603209feee4;hpb=4377e950998c9c63937582952a79975947aa9a45;p=helm.git

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