proposition: Lemma rdvdpp : rdvdp d d.
proof: Proof. by apply: rdvdpp; rewrite (eqP mond); [apply: commr1 | apply: rreg1]. Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop ssralg poly)