proposition: Lemma comp_lfun1r f : (f \o \1)%VF = f.
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)