proposition: Lemma divpp d : d != 0 -> d %/ d = 1.
proof: Proof. by move=> dn0; apply: IdomainUnit.divpp; rewrite unitfE lead_coef_eq0. Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop ssralg poly)