Question 1. (exercise 26 in textbook) Let A be a σ algebra of subsets of Ω...

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Question 1. (exercise 26 in textbook) Let A be a σ algebra of subsets of Ω and let B E A Show that F = {An B : A e A} is a σ algebra of subsets of B Is it still true when B is a subset of Ω that does not belong to A?

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