Dynkin lemma
= Dynkin lemma
{c}
Every Dynkin system containing a pi-system $\mathcal P$ also contains the sigma-algebra $\sigma(\mathcal P)$. Equivalently, the Dynkin system generated by a pi-system equals the sigma-algebra it generates.
= Dynkin lemma
{c}
Every Dynkin system containing a pi-system $\mathcal P$ also contains the sigma-algebra $\sigma(\mathcal P)$. Equivalently, the Dynkin system generated by a pi-system equals the sigma-algebra it generates.