(* NOTATION FOR THE FORMAL SYSTEM λδ ****************************************)
-notation "hvbox( T1 ⩳ [ break term 46 h , break term 46 o ] break term 46 T2 )"
+notation "hvbox( T1 ⩳ [ break term 46 h, break term 46 o ] break term 46 T2 )"
non associative with precedence 45
for @{ 'TopIso $h $o $T1 $T2 }.