proposition: Lemma scale_lfunE k f x : (k *: f) x = k *: f x.
proof: Proof. exact: lfunE. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop finfun tuple) mathcomp(ssralg matrix mxalgebra zmodp)