- Unified : some definitions of unified \lambda\delta

[helm.git] / helm / software / matita / contribs / RELATIONAL / BEq / defs.ma

diff --git a/helm/software/matita/contribs/RELATIONAL/BEq/defs.ma b/helm/software/matita/contribs/RELATIONAL/BEq/defs.ma
index 0b52af116a59c63f0a89c3f0ca05cbf14fa46e8e..d851a6b9fda2a98e45b90f067c7a140c229a0907 100644 (file)
--- a/helm/software/matita/contribs/RELATIONAL/BEq/defs.ma
+++ b/helm/software/matita/contribs/RELATIONAL/BEq/defs.ma
@@ -19,6 +19,14 @@ include "logic/equality.ma".
 include "BNot/defs.ma".
 
 inductive BEq (b1:Bool): Bool \to Bool \to Prop \def
-   | beq_false: \forall b2. BNot b1 b2 \to BEq b1 false b2
+   | beq_false: \forall b2. (~b1 == b2) \to BEq b1 false b2
    | beq_true : BEq b1 true b1
 .
+
+(*CSC: the URI must disappear: there is a bug now *)
+interpretation "boolean coimplication predicate" 'rel_coimp x y z = 
+   (cic:/matita/RELATIONAL/BEq/defs/BEq.ind#xpointer(1/1) x y z).
+
+notation "hvbox(a break * b break == c)" 
+  non associative with precedence 95
+for @{ 'rel_coimp $a $b $c}.