proposition: Lemma add_fun_is_scalable : scalable_for s (f \+ g).
proof: Proof. by move=> a u; rewrite /= !linearZ_LR raddfD. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat div seq) mathcomp(choice fintype finfun bigop prime binomial)