proposition: Lemma val_enum_ord n : [seq val i | i <- enum 'I_n] = iota 0 n.
proof: Proof. by rewrite enum_ord val_enum_ord. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(path fintype tuple bigop finset div prime finfun) mathcomp(finset)