proposition: Lemma subfx_inj_base b : subfx_inj b%:A = iota b.
proof: Proof. by rewrite subfx_injZ rmorph1 mulr1. 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)