(R : Ring) (x : R) `{!IsInvertible R x} : IsInvertible (rng_op R) x. Proof. split. - exact (isrightinvertible_isinvertible). - exact (isleftinvertible_isinvertible). Defined.
Require Import WildCat. Require Import Spaces.Nat.Core Spaces.Nat.Arithmetic. Require Import Classes.interfaces.abstract_algebra. Require Import Algebra.Groups.Group Algebra.Groups.Subgroup. Require Import Modalities.ReflectiveSubuniverse.