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