proposition: Lemma annul_alg_neq0 (x : {alg F}) : annul_alg x != 0.
proof: Proof. by rewrite monic_neq0 ?monic_annul_alg. 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)