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[helm.git] / matita / library / logic / connectives.ma

diff --git a/matita/library/logic/connectives.ma b/matita/library/logic/connectives.ma
index 4cbea3529a7ec983b39f814f1243f1a5f92568ab..5afc3e5dc29d7db0f45e812d244f6cd72e4ff7f6 100644 (file)
--- a/matita/library/logic/connectives.ma
+++ b/matita/library/logic/connectives.ma
@@ -79,12 +79,8 @@ inductive ex (A:Type) (P:A \to Prop) : Prop \def
 interpretation "exists" 'exists \eta.x =
   (cic:/matita/logic/connectives/ex.ind#xpointer(1/1) _ x).
 
-notation < "hvbox(\exists ident i opt (: ty) break . p)"
-  right associative with precedence 20
-for @{ 'exists ${default
-  @{\lambda ${ident i} : $ty. $p)}
-  @{\lambda ${ident i} . $p}}}.
-
 inductive ex2 (A:Type) (P,Q:A \to Prop) : Prop \def
     ex_intro2: \forall x:A. P x \to Q x \to ex2 A P Q.
 
+definition iff :=
+ \lambda A,B. (A -> B) \land (B -> A).
\ No newline at end of file