{G H K : Group} : GroupHomomorphism H K -> GroupHomomorphism G H -> GroupHomomorphism G K. Proof. intros f g. srapply (Build_GroupHomomorphism (f o g)). Defined.
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.