proposition: Lemma denqP x : {d | denq x = d.+1}.
proof: Proof. by rewrite /denq; case: x => [[_ [[|d]|]] //= _]; exists d. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop order ssralg countalg div ssrnum) mathcomp(ssrint prime archimedean)