X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;ds=inline;f=matita%2Fmatita%2Flib%2Fformal_topology%2Fcategories.ma;h=94a8d22ebb6f69dd64c249677e30c74ee7fdb9d3;hb=7c9d99dfb049d726491b71f07ba6a9b088b30166;hp=02605e4a87da4ab6491c1ff9467311d76db311b5;hpb=b5cb5cc7230870f757aadbe6b43ee146fe485a6d;p=helm.git

diff --git a/matita/matita/lib/formal_topology/categories.ma b/matita/matita/lib/formal_topology/categories.ma
index 02605e4a8..94a8d22eb 100644
--- a/matita/matita/lib/formal_topology/categories.ma
+++ b/matita/matita/lib/formal_topology/categories.ma
@@ -14,6 +14,7 @@
 
 include "formal_topology/cprop_connectives.ma".
 include "basics/core_notation/compose_2.ma".
+include "basics/core_notation/invert_1.ma".
 
 inductive eq (A:Type[0]) (x:A) : A → CProp[0] ≝
     refl: eq A x x.