proposition: Lemma Fadjoin_nil K : <<K & [::]>>%VS = K.
proof: Proof. by rewrite adjoin_nil subfield_closed. 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)