proposition: Lemma scaler_RVA X k l : scaler_RV X (k * l) = scaler_RV (scaler_RV X k) l.
proof: Proof. by rewrite /scaler_RV boolp.funeqE => u; rewrite mulRA. Qed.
imports: mathcomp(all_ssreflect ssralg ssrnum matrix) mathcomp(Rstruct reals) Reals Lra ssrR Reals_ext realType_ext logb ssr_ext ssralg_ext bigop_ext fdist