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