proposition: Lemma horner_mx_C a : horner_mx a%:P = a%:M.
proof: Proof. exact: horner_morphC. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(div fintype tuple finfun bigop fingroup perm) mathcomp(ssralg zmodp matrix mxalgebra poly polydiv)