X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Flib%2Fbasics%2Fsets.ma;fp=matita%2Fmatita%2Flib%2Fbasics%2Fsets.ma;h=8e40b666bfdee2eb318478d2899a3bece809619f;hb=db020b4218272e2e35641ce3bc3b0a9b3afda899;hp=2f570c18feb503e1da38186bf9455a8c0b9e1018;hpb=d8f6494f48aa08bb32d9d1ac82fc16e9e41b76ac;p=helm.git

diff --git a/matita/matita/lib/basics/sets.ma b/matita/matita/lib/basics/sets.ma
index 2f570c18f..8e40b666b 100644
--- a/matita/matita/lib/basics/sets.ma
+++ b/matita/matita/lib/basics/sets.ma
@@ -11,6 +11,7 @@
 
 include "basics/logic.ma".
 include "basics/core_notation/singl_1.ma".
+include "basics/core_notation/subseteq_2.ma".
 
 (**** a subset of A is just an object of type A→Prop ****)