proposition: Lemma nth_codom T' y0 (f : T -> T') (i : 'I_#|T|) : nth y0 (codom f) i = f (enum_val i).
proof: Proof. exact: nth_image. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(path div)