{R : Ring} (I : Ideal R) : Ideal R := ideal_intersection (ideal_left_annihilator I) (ideal_right_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.