X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Flib%2Fformal_topology%2Frelations.ma;h=3516999008aa714be19b99bf19b068dc585881dc;hb=b5cb5cc7230870f757aadbe6b43ee146fe485a6d;hp=2d5d85a6be9a1dc0cca55b46d702694b655712a8;hpb=38b251338be469c7bcd75cb9f243fad9ba8f0907;p=helm.git

diff --git a/matita/matita/lib/formal_topology/relations.ma b/matita/matita/lib/formal_topology/relations.ma
index 2d5d85a6b..351699900 100644
--- a/matita/matita/lib/formal_topology/relations.ma
+++ b/matita/matita/lib/formal_topology/relations.ma
@@ -12,6 +12,7 @@
 (*                                                                        *)
 (**************************************************************************)
 
+include "basics/core_notation/comprehension_2.ma".
 include "formal_topology/subsets.ma".
 (*
 record binary_relation (A,B: SET) : Type[1] ≝