X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Flib%2Fbasics%2Fsets.ma;h=8e40b666bfdee2eb318478d2899a3bece809619f;hb=bf816f05ddbe0ded4948dd33490619724dc4f7cf;hp=cdc6ac9e8e278e19c3d7957bf600f7150ae1d895;hpb=1be73cca08e69479424dd235fb95b2168b2854be;p=helm.git

diff --git a/matita/matita/lib/basics/sets.ma b/matita/matita/lib/basics/sets.ma
index cdc6ac9e8..8e40b666b 100644
--- a/matita/matita/lib/basics/sets.ma
+++ b/matita/matita/lib/basics/sets.ma
@@ -10,6 +10,8 @@
       V_______________________________________________________________ *)
 
 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 ****)
 
@@ -116,4 +118,4 @@ qed.
 (* substraction *)
 lemma substract_def:∀U.∀A,B:U→Prop. A-B ≐ A ∩ ¬B.
 #U #A #B #w normalize /2/
-qed.
\ No newline at end of file
+qed.