X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fmatita%2Fnlibrary%2Fdatatypes%2Fbool.ma;h=be42b597a5abd471a2000a85272ecb12d50d06fe;hb=a90c31c1b53222bd6d57360c5ba5c2d0fe7d5207;hp=eda979d69b3c1121e76dadec86b5c789f8559086;hpb=4377e950998c9c63937582952a79975947aa9a45;p=helm.git

diff --git a/helm/software/matita/nlibrary/datatypes/bool.ma b/helm/software/matita/nlibrary/datatypes/bool.ma
index eda979d69..be42b597a 100644
--- a/helm/software/matita/nlibrary/datatypes/bool.ma
+++ b/helm/software/matita/nlibrary/datatypes/bool.ma
@@ -14,9 +14,6 @@
 
 include "logic/pts.ma".
 
-ninductive bool: Type[0] ≝ true: bool | false: bool.
- 
-ndefinition orb ≝ λa,b:bool. match a with [ true ⇒ true | _ ⇒ b ].
-
-notation "a || b" left associative with precedence 30 for @{'orb $a $b}.
-interpretation "orb" 'orb a b = (orb a b).
\ No newline at end of file
+ninductive bool: Type[0] ≝
+   true: bool
+ | false: bool.
\ No newline at end of file