proposition: Lemma numqK : {in Num.int, cancel (fun x => numq x) intr}.
proof: Proof. by move=> _ /intrP [x ->]; rewrite numq_int. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop order ssralg countalg div ssrnum) mathcomp(ssrint prime archimedean)