proposition: Lemma gen_dim_ex_proof : exists nA, [exists B : 'rV_nA, row_free (subbase B)].
proof: Proof. by exists 0; apply/existsP; exists 0; rewrite /row_free unlock. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq path) mathcomp(div choice fintype tuple finfun bigop prime) mathcomp(ssralg poly polydiv finset fingroup morphism) mathcomp(perm automorphism quotient finalg action zmodp) mathcomp(commutator cyclic center pgroup matrix mxalgebra) mathcomp(mxpoly)