(R : Ring) := { ideal_subgroup :> Subgroup R; ideal_isideal :: IsIdeal ideal_subgroup; }.
Require Import Basics Types. Require Import Spaces.Finite.Fin. Require Import Classes.interfaces.canonical_names. Require Import Algebra.Rings.Ring. Require Import Algebra.Groups.Subgroup. Require Import Algebra.AbGroups. Require Import WildCat.Core. Module Import Notation.