proposition: Lemma aut_natr nu : {in nat_num, nu =1 id}.
proof: Proof. by move=> _ /natrP[n ->]; apply: rmorph_nat. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop order ssralg poly ssrnum ssrint)