proposition: Lemma nth_ord_enum (n : nat) (i0 i : 'I_n) : nth i0 (enum 'I_n) i = i.
proof: Proof. by rewrite enum_ord nth_ord_enum. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(path fintype tuple bigop finset div prime finfun) mathcomp(finset)