proposition: Lemma expZ mu F c : \E_[mu] (c \*o F) = c * \E_[mu] F.
proof: Proof. by rewrite -sumZ; apply/eq_sum=> x /=; rewrite mulrA. Qed.
imports: mathcomp(all_ssreflect all_algebra) mathcomp.classical(boolp classical_sets mathcomp_extra) xfinmap ereal reals discrete topology realseq realsum