proposition: Lemma algdomP x : (annul_algdom x).[center_alg x - radius_alg x] * (annul_algdom x).[center_alg x + radius_alg x] <= 0.
proof: Proof. by case: x. Qed.
imports: HB(structures) mathcomp.ssreflect.ssreflect mathcomp(ssrfun ssrbool eqtype ssrnat seq choice fintype) mathcomp(bigop order ssralg ssrnum ssrint rat poly polydiv polyorder) mathcomp(perm matrix mxpoly polyXY binomial generic_quotient) mathcomp(cauchyreals separable zmodp bigenough)