X-Git-Url: http://matita.cs.unibo.it/gitweb/?p=helm.git;a=blobdiff_plain;f=matita%2Fcontribs%2FPREDICATIVE-TOPOLOGY%2Fiff.ma;fp=matita%2Fcontribs%2FPREDICATIVE-TOPOLOGY%2Fiff.ma;h=0e6205148d0de93c0de50e48c8d96becc186ed82;hp=0000000000000000000000000000000000000000;hb=f61af501fb4608cc4fb062a0864c774e677f0d76;hpb=58ae1809c352e71e7b5530dc41e2bfc834e1aef1

diff --git a/matita/contribs/PREDICATIVE-TOPOLOGY/iff.ma b/matita/contribs/PREDICATIVE-TOPOLOGY/iff.ma
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+(**************************************************************************)
+(*       ___                                                              *)
+(*      ||M||                                                             *)
+(*      ||A||       A project by Andrea Asperti                           *)
+(*      ||T||                                                             *)
+(*      ||I||       Developers:                                           *)
+(*      ||T||         The HELM team.                                      *)
+(*      ||A||         http://helm.cs.unibo.it                             *)
+(*      \   /                                                             *)
+(*       \ /        This file is distributed under the terms of the       *)
+(*        v         GNU General Public License Version 2                  *)
+(*                                                                        *)
+(**************************************************************************)
+
+(* STATO: COMPILA *)
+
+set "baseuri" "cic:/matita/logic/iff".
+
+include "../../library/logic/connectives.ma".
+
+definition Iff : Prop \to Prop \to Prop \def
+   \lambda A,B. (A \to B) \land (B \to A).
+   
+ (*CSC: the URI must disappear: there is a bug now *)
+interpretation "logical iff" 'iff x y = (cic:/matita/logic/iff/Iff.con x y).
+
+notation > "hvbox(a break \liff b)" 
+  left associative with precedence 25
+for @{ 'iff $a $b }.
+
+notation < "hvbox(a break \leftrightarrow b)" 
+  left associative with precedence 25
+for @{ 'iff $a $b }.