proposition: Lemma pp_dvdr : forall p, pp p %| p.
proof: Proof. by move=> p; apply/dvdrP; exists (gcdsr p)%:P; exact: ppP. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat div seq) mathcomp(path choice fintype tuple finset ssralg) mathcomp(matrix poly) mathcomp(bigop polydiv) CoqEAL(stronglydiscrete dvdring)