(R : Ring) : {I : Subgroup R& IsRightIdeal (R:=R) I} <~> RightIdeal R := ltac:(issig).
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.