{G H K : Group} (g : GroupIsomorphism H K) (f : GroupIsomorphism G H) : GroupIsomorphism G K := Build_GroupIsomorphism _ _ (grp_homo_compose g f) _.
Require Import Basics Types HProp HFiber HSet. Require Import Homotopy.IdentitySystems. Require Import (notations) Classes.interfaces.canonical_names. Require Import Pointed.Core. Require Import WildCat. Require Import Spaces.Nat.Core Spaces.Int. Require Import Truncations.Core.