proposition: Lemma mul_rV_lin u : u *m lin_mx f = mxvec (f (vec_mx u)).
proof: Proof. exact: mul_rV_lin1. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype finfun bigop finset fingroup perm order) mathcomp(div prime binomial ssralg countalg finalg zmodp)