Because the set a is the complement of a these are

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Because the set − , a is the complement of a , , these are also in B . 28
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All sets of the form a , b , a , b , a , k 1 , k 2 ,..., k m are in B . In fact, any subset of we can imagine is in B ; some strange ones are not. When the sample space is restricted, say   0,1 or   0, the Borel -field is defined in a similar way but we restrict attention to subsets of . 29
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