proposition: Lemma ratr_int z : ratr z%:~R = z%:~R.
proof: Proof. by rewrite /ratr numq_int denq_int divr1. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop order ssralg countalg div ssrnum) mathcomp(ssrint prime archimedean)