Definition istranshzgeh ( n m k : hz ) : hzgeh n m -> hzgeh m k -> hzgeh n k := λ gnm gmk, istranshzleh _ _ _ gmk gnm .
Require Import UniMath.MoreFoundations.PartA. Require Import UniMath.Algebra.Monoids. Require Import UniMath.Algebra.Groups.