proposition: Lemma expeR_ge0 x : 0 <= expeR x.
proof: Proof. by case: x => //= r; rewrite lee_fin expR_ge0. Qed.
imports: mathcomp(all_ssreflect ssralg ssrint ssrnum matrix) mathcomp(interval rat) mathcomp(boolp classical_sets functions) mathcomp(mathcomp_extra) reals ereal signed topology normedtype landau sequences derive realfun itv convex