X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fmatita%2Fcontribs%2FPREDICATIVE-TOPOLOGY%2Fiff.ma;fp=helm%2Fsoftware%2Fmatita%2Fcontribs%2FPREDICATIVE-TOPOLOGY%2Fiff.ma;h=0000000000000000000000000000000000000000;hb=ef05c795559108c1d33cfa048531849807867a81;hp=0e6205148d0de93c0de50e48c8d96becc186ed82;hpb=718d9bcfb53dd76a5c0622aff9fed69a68769324;p=helm.git

diff --git a/helm/software/matita/contribs/PREDICATIVE-TOPOLOGY/iff.ma b/helm/software/matita/contribs/PREDICATIVE-TOPOLOGY/iff.ma
deleted file mode 100644
index 0e6205148..000000000
--- a/helm/software/matita/contribs/PREDICATIVE-TOPOLOGY/iff.ma
+++ /dev/null
@@ -1,33 +0,0 @@
-(**************************************************************************)
-(*       ___                                                              *)
-(*      ||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 }.