Show that \(E\) is measurable iff \(E\) is regular.
Show that if \(\sum \mu(E_k) < \infty\) then almost every \(x\in X\) is in at most finitely many \(E_k\).
Show that \(E\) is measurable iff \(E\) is regular.
Show that if \(\sum \mu(E_k) < \infty\) then almost every \(x\in X\) is in at most finitely many \(E_k\).