notation "s \sup (-1)" with precedence 60 for @{ 'invert $s }.
notation < "s \sup (-1) x" with precedence 60 for @{ 'invert_appl $s $x}.
+notation "hvbox(|term 90 C|)" with precedence 69 for @{ 'card $C }.
notation "\naturals" non associative with precedence 90 for @{'N}.
notation "\rationals" non associative with precedence 90 for @{'Q}.
interpretation "Finite_enumerable representation" 'repr C i =
(cic:/matita/algebra/finite_groups/repr.con C _ i).*)
-notation < "hvbox(|C|)" with precedence 89
-for @{ 'card $C }.
-
interpretation "Finite_enumerable order" 'card C =
(cic:/matita/algebra/finite_groups/order.con C _).