X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Flib%2Fformal_topology%2Frelations.ma;h=3516999008aa714be19b99bf19b068dc585881dc;hb=053be41a8db6aa0ca7cc06fb569ec284a9bcc5ef;hp=2d5d85a6be9a1dc0cca55b46d702694b655712a8;hpb=716338697e54d7a7e3602aabdecc2a8a639d683e;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] ≝