X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fmatita%2Fdama%2Ftopology.ma;h=f068fcbd56bc79c914740bc9752c0e14bcef6dcb;hb=5e736134ceab076b4e963d535f380ffa796a5d19;hp=e0a926d7673ebbbcdaf9ce8fd5582e3857a5c401;hpb=19b11f38db15de2f7e093eb8f25d3cec4988d680;p=helm.git

diff --git a/helm/software/matita/dama/topology.ma b/helm/software/matita/dama/topology.ma
index e0a926d76..f068fcbd5 100644
--- a/helm/software/matita/dama/topology.ma
+++ b/helm/software/matita/dama/topology.ma
@@ -16,7 +16,7 @@ set "baseuri" "cic:/matita/topology/".
 
 include "sets.ma".
 
-record is_topology X (A: set X) (O: set (set X)) : Prop  ≝
+record is_topology (X) (A: set X) (O: set (set X)) : Prop  ≝
  { top_subset: ∀B. B ∈ O → B ⊆ A;
    top_empty: ∅︀ ∈ O;
    top_full: A ∈ O;