December 26th, 2015, 06:41 AM  #1 
Newbie Joined: Dec 2015 From: albania Posts: 3 Thanks: 0  Lebesgue measure
Hi, I need some help on solving an exercise. M is a set collection and R(M) is the smallest sigma algebra that M⊂R(M). Prove if A∈R(M) then A is hold in a countable union of sets from M.R(M) is the smallest sigma that holds M. I have tried to do this. Let K be a collection of all subsets that are held in countable unions of elements in M. Need to show that M is in K and that K is a ring. 

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lebesgue, measure 
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