proposition: Lemma lefun_trans g f h : lefun f g -> lefun g h -> lefun f h.
proof: Proof. move => Hfg Hgh a; move : (Hfg a) (Hgh a); exact: leconv_trans. Qed.
imports: HB(structures) mathcomp(all_ssreflect ssralg fingroup perm matrix) mathcomp(mathcomp_extra boolp classical_sets Rstruct) mathcomp(ssrnum ereal) mathcomp(lra Rstruct reals) Reals ssrR Reals_ext Ranalysis_ext ssr_ext ssralg_ext logb realType_ext fdist