proposition: Lemma roots_on_opp p i s : roots_on (- p) i s -> roots_on p i s.
proof: Proof. by move=> hp x; rewrite -hp rootN. 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)