fixed some stuff

[helm.git] / helm / software / matita / contribs / dama / dama / ordered_set.ma

diff --git a/helm/software/matita/contribs/dama/dama/ordered_set.ma b/helm/software/matita/contribs/dama/dama/ordered_set.ma
index 45a8a1b379c1e4d866dd48a6d1c575bce6edb971..06c222830351ef1e2820df5af1f30c3ce0663095 100644 (file)
--- a/helm/software/matita/contribs/dama/dama/ordered_set.ma
+++ b/helm/software/matita/contribs/dama/dama/ordered_set.ma
@@ -12,6 +12,7 @@
 (*                                                                        *)
 (**************************************************************************)
 
+include "datatypes/constructors.ma".
 include "logic/cprop_connectives.ma".
 
 (* Definition 2.1 *)