Hey, a sequence of subsets of , a -field on .
Hints on how to start?
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Let . We can find such that for , . Now, you have to show that for all , .
"To be in " means "to be in all for large enough" whereas "To be in " means "to be in infinitely many ".
If but this means which is a contradiction.
And clearly , whence
Is this ok?
Yes, it works.
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