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