proposition: Lemma rootC1 n : (n > 0)%N -> n.-root 1 = 1.
proof: Proof. by move/(rootCX 0)/(_ ler01). Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)