proposition: Lemma numer_Ratio x y : y != 0 -> (Ratio x y).1 = x.
proof: Proof. by move=> ny0; rewrite /Ratio /insubd insubT. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat div seq) mathcomp(ssrAC choice tuple bigop ssralg poly polydiv) mathcomp(generic_quotient)