(* NOTATION FOR THE FORMAL SYSTEM λδ ****************************************)
-notation "hvbox( G â\8a¢ break term 46 L1 â\8a\91 break [ term 46 R ] break term 46 L2 )"
+notation "hvbox( G â\8a¢ break term 46 L1 â«\83 break [ term 46 R ] break term 46 L2 )"
non associative with precedence 45
for @{ 'LRSubEq $R $G $L1 $L2 }.