proposition: Lemma dim_polyn : \dim (fullv : {vspace {poly_n K}}) = n.
proof: Proof. by rewrite [LHS]mxrank_gen mxrank1. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice fintype tuple) mathcomp(bigop binomial finset finfun ssralg countalg finalg poly polydiv) mathcomp(perm fingroup matrix mxalgebra mxpoly vector countalg)