proposition: Lemma field_subvMl F U : (U <= F * U)%VS.
proof: Proof. by rewrite -{1}[U]prod1v prodvSl ?sub1v. 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)