proposition: Lemma raddfMNn n : {morph f : x / x *- n}.
proof: Proof. by move=> x /=; rewrite raddfN raddfMn. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat div seq) mathcomp(choice fintype finfun bigop prime binomial)