proposition: Lemma comp_kHom K E f g : kHom K {:L} f -> kHom K E g -> kHom K E (f \o g).
proof: Proof. by move/(kHomSr (subvf (g @: E))); apply: comp_kHom_img. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq div) mathcomp(choice fintype tuple finfun bigop ssralg poly) mathcomp(polydiv finset fingroup morphism quotient perm) mathcomp(action zmodp cyclic matrix mxalgebra vector) mathcomp(falgebra fieldext separable)