proposition: Lemma denq_neq0 x : denq x != 0.
proof: Proof. by rewrite /denq gt_eqF ?denq_gt0. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop order ssralg countalg div ssrnum) mathcomp(ssrint prime archimedean)