tunaaa
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This appears to be the only difference between a sigma-algebra and a Dynkin system:
This seems to result in the D-system not being a pi-system (while the sigma-alg is). Why?
Many thanks.
- Sigma-algebra is closed under countable union
- Dynkin system is closed under countable union of disjoint sets
This seems to result in the D-system not being a pi-system (while the sigma-alg is). Why?
Many thanks.