Question: EXERCISE: Prove that the intersection of any (countable or uncountable) family of -fields (over one and the same sample space ) is always a -field,

EXERCISE: Prove that the intersection ofany(countable or uncountable) family of-fields (over one and the same sample space) is always a-field, and explain why the same claim cannot be made about a union of-fields - even about the union of just two-fields.

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