proposition: Lemma dim_sup_field F E : (F <= E)%VS -> \dim E = (\dim_F E * \dim F)%N.
proof: Proof. by move/field_dimS/divnK. 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)