proposition: Lemma raddfMnat n x : f (n%:R * x) = n%:R * f x.
proof: Proof. by rewrite !mulr_natl raddfMn. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat div seq) mathcomp(choice fintype finfun bigop prime binomial)