proposition: Lemma subfx_injZ b x : subfx_inj (b *: x) = iota b * subfx_inj x.
proof: Proof. by rewrite rmorphM /= subfx_inj_eval // map_polyC hornerC. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq div) mathcomp(choice fintype tuple finfun bigop ssralg countalg) mathcomp(finalg zmodp matrix vector falgebra poly polydiv) mathcomp(mxpoly generic_quotient)