X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fmatita%2Fnlibrary%2FPlogic%2Fconnectives.ma;h=bf17771fb9890a632f0f49f2b8e223837712f36a;hb=e880d6eab5e1700f4a625ddcd7d0fa8f0cce2dcc;hp=491657676a85ada0ae073947190306fedbb0af87;hpb=2371237a27b5fa23f741e381073a48d84bc6a906;p=helm.git

diff --git a/helm/software/matita/nlibrary/Plogic/connectives.ma b/helm/software/matita/nlibrary/Plogic/connectives.ma
index 491657676..bf17771fb 100644
--- a/helm/software/matita/nlibrary/Plogic/connectives.ma
+++ b/helm/software/matita/nlibrary/Plogic/connectives.ma
@@ -75,3 +75,5 @@ ninductive ex2 (A:Type[0]) (P,Q:A \to Prop) : Prop ≝
 
 ndefinition iff :=
  λ A,B. (A → B) ∧ (B → A).
+
+interpretation "iff" 'iff a b = (iff a b).