proposition: Lemma ratRz m : m%:Q = m :> R.
proof: Proof. by rewrite /ratRR /ratR rpred_int numq_int. Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat div order) mathcomp(ssralg ssrnum ssrint rat intdiv) Coq(Morphisms Setoid) fourcolor(real realsyntax)