proposition: Lemma horner_crealX (x : creal) : 'X.[x] == x.
proof: Proof. by apply: eq_crealP; exists m0=> *; rewrite /= hornerX subrr normr0. Qed.
imports: 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 bigenough)