proposition: Lemma denq_eq0 x : (denq x == 0) = false.
proof: Proof. exact: negPf (denq_neq0 _). Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop order ssralg countalg div ssrnum) mathcomp(ssrint prime archimedean)