+
+(*CSC: the URI must disappear: there is a bug now *)
+interpretation "natural plus predicate" 'rel_plus x y z =
+ (cic:/matita/RELATIONAL/NPlus/defs/NPlus.ind#xpointer(1/1) x y z).
+
+notation "hvbox(a break + b break == c)"
+ non associative with precedence 95
+for @{ 'rel_plus $a $b $c}.