proposition: Lemma comp_lfunZr k f g : (k *: (f \o g) = f \o (k *: g))%VF.
proof: Proof. by apply/lfunP=> u; do !rewrite lfunE /=; rewrite linearZ. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop finfun tuple) mathcomp(ssralg matrix mxalgebra zmodp)