proposition: Lemma sorted_roots a b p : sorted <%R (roots p a b).
proof: Proof. by case: rootsP. 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)