proposition: Lemma Ratio_numden (x : {ratio R}) : Ratio \n_x \d_x = x.
proof: Proof. exact: FracField.Ratio_numden. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat div seq) mathcomp(ssrAC choice tuple bigop ssralg poly polydiv) mathcomp(generic_quotient)