From: Stefano Zacchiroli <zack@upsilon.cc>
Date: Tue, 20 Sep 2005 15:31:01 +0000 (+0000)
Subject: added non-builtin notation for exists
X-Git-Tag: LAST_BEFORE_NEW~77
X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=commitdiff_plain;h=2a990279a83acb9736bbaaf3d978bc4ae994880b;p=helm.git

added non-builtin notation for exists
actually, the parsing rules is built-in, while the pretty priting one is not
---

diff --git a/helm/matita/library/logic/connectives.ma b/helm/matita/library/logic/connectives.ma
index 6437bd132..15b1cfe10 100644
--- a/helm/matita/library/logic/connectives.ma
+++ b/helm/matita/library/logic/connectives.ma
@@ -54,7 +54,8 @@ inductive Or (A,B:Prop) : Prop \def
    | or_intror : B \to (Or A B).
 
 (*CSC: the URI must disappear: there is a bug now *)
-interpretation "logical or" 'or x y = (cic:/matita/logic/connectives/Or.ind#xpointer(1/1) x y).
+interpretation "logical or" 'or x y =
+  (cic:/matita/logic/connectives/Or.ind#xpointer(1/1) x y).
    
 definition decidable : Prop \to Prop \def \lambda A:Prop. A \lor \not A.
 
@@ -62,7 +63,15 @@ inductive ex (A:Type) (P:A \to Prop) : Prop \def
     ex_intro: \forall x:A. P x \to ex A P.
 
 (*CSC: the URI must disappear: there is a bug now *)
-interpretation "exists" 'exists x y = (cic:/matita/logic/connectives/ex.ind#xpointer(1/1) x y).
+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.
+