we added a definition and a couple of lemmas

[helm.git] / matita / matita / lib / basics / relations.ma

diff --git a/matita/matita/lib/basics/relations.ma b/matita/matita/lib/basics/relations.ma
index a1bae198b707723b66f5ba16db61ac1cac58deab..a82f314f698e9dc23fb479c56848c83b586d2654 100644 (file)
--- a/matita/matita/lib/basics/relations.ma
+++ b/matita/matita/lib/basics/relations.ma
@@ -11,6 +11,11 @@
 
 include "basics/logic.ma".
 
+(********** preducates *********)
+
+definition predicate: Type[0] → Type[0]
+≝ λA.A→Prop.
+
 (********** relations **********)
 definition relation : Type[0] → Type[0]
 ≝ λA.A→A→Prop.