notation > "s ^ (-1)" non associative with precedence 75 for @{ 'invert $s }.
notation < "s \sup (-1) x" non associative with precedence 90 for @{ 'invert_appl $s $x}.
-notation "hvbox(|term 90 C|)" with precedence 69 for @{ 'card $C }.
+notation "| term 19 C |" with precedence 70 for @{ 'card $C }.
notation "\naturals" non associative with precedence 90 for @{'N}.
notation "\rationals" non associative with precedence 90 for @{'Q}.