proposition: Lemma neighpl_root p a x : {in neighpl p a x, noroot p}.
proof: Proof. exact: prev_noroot. Qed.
imports: mathcomp.ssreflect.ssreflect mathcomp(ssrfun ssrbool eqtype ssrnat seq choice fintype) mathcomp(bigop order ssralg poly polydiv ssrnum zmodp) mathcomp(polyorder path interval ssrint)