This appears to be the only difference between a sigma-algebra and a Dynkin system:(adsbygoogle = window.adsbygoogle || []).push({});

- Sigma-algebra is closed under countable union
- Dynkin system is closed under countable union
of disjoint sets

This seems to result in the D-systemnotbeing a pi-system (while the sigma-alg is). Why?

Many thanks.

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# Why is a Dynkin system not a Pi-system

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