Definition hzlthandmultrinv ( n m k : hz ) ( is : hzgth k 0 ) : hzlth ( n * k ) ( m * k ) -> hzlth n m := hzgthandmultrinv _ _ _ is .
Require Import UniMath.MoreFoundations.PartA. Require Import UniMath.Algebra.Monoids. Require Import UniMath.Algebra.Groups.