proposition: Lemma comp_lfunNl f g : ((- f) \o g = - (f \o g))%VF.
proof: Proof. by apply/lfunP=> u; do !rewrite lfunE /=. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop finfun tuple) mathcomp(ssralg matrix mxalgebra zmodp)