{R : Ring} (I : LeftIdeal R) : Ideal R := Build_Ideal R (subgroup_ideal_left_annihilator I) _.
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.