proposition: Lemma subvs_fieldMixin K : GRing.field_axiom (subvs_of K).
proof: Proof. by move=> w nz_w; rewrite unitrE -val_eqE /= vsval_invf algid1 divff. 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)