update in ground and delayed updating

[helm.git] / matita / matita / contribs / lambdadelta / ground / lib / subset_equivalence.ma

diff --git a/matita/matita/contribs/lambdadelta/ground/lib/subset_equivalence.ma b/matita/matita/contribs/lambdadelta/ground/lib/subset_equivalence.ma
index b3957eaf304a6079d1dd03c0ccdbbcd9738b40ce..cddb51e89370ace7f4e6ce76ca712220e05d6a6d 100644 (file)
--- a/matita/matita/contribs/lambdadelta/ground/lib/subset_equivalence.ma
+++ b/matita/matita/contribs/lambdadelta/ground/lib/subset_equivalence.ma
@@ -17,7 +17,7 @@ include "ground/lib/subset_inclusion.ma".
 
 (* EQUIVALENCE FOR SUBSETS **************************************************)
 
-definition subset_eq (A): relation2 𝒫❨A❩ 𝒫❨A❩ ≝
+definition subset_eq (A): relation2 (𝒫❨A❩) (𝒫❨A❩) ≝
            λu1,u2. ∧∧ u1 ⊆ u2 & u2 ⊆ u1.
 
 interpretation