proposition: Lemma pp0 : pp 0 = 0.
proof: Proof. by rewrite /pp /odivr gcdsr0 /div /= /odivp eqxx. 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)