an addition ...

[helm.git] / matita / matita / contribs / lambda_delta / ground_2 / notation.ma

diff --git a/matita/matita/contribs/lambda_delta/ground_2/notation.ma b/matita/matita/contribs/lambda_delta/ground_2/notation.ma
index 574bd3c595c4c3daba77eac86da095f243603604..4ac2e6e645c54ca5cf2a3a1b11ec7b10baaee8dc 100644 (file)
--- a/matita/matita/contribs/lambda_delta/ground_2/notation.ma
+++ b/matita/matita/contribs/lambda_delta/ground_2/notation.ma
@@ -14,9 +14,19 @@
 
 (* GENERAL NOTATION USED BY THE FORMAL SYSTEM λδ ****************************)
 
+(* Logic ********************************************************************)
+
+notation "⊥"
+  non associative with precedence 90
+  for @{'false}.
+
+notation "⊤"
+  non associative with precedence 90
+  for @{'true}.
+
 (* Lists ********************************************************************)
 
-notation "hvbox( ◊ )"
+notation "◊"
   non associative with precedence 90
   for @{'Nil}.
 
@@ -28,7 +38,7 @@ notation "hvbox( l1 @@ break l2 )"
   right associative with precedence 47
   for @{'Append $l1 $l2 }.
 
-notation "hvbox( ⟠ )"
+notation "⟠"
   non associative with precedence 90
   for @{'Nil2}.