(* NOTATION FOR DELAYED UPDATING ********************************************)
-notation "hvbox( ▼[ term 46 t1 ] break term 70 t2 )"
+notation "hvbox( ▼[ term 46 t1 ] break term 70 t2 )"
non associative with precedence 70
for @{ 'BlackDownTriangle $t1 $t2 }.