Show directly that condition (i) of Lemma 8.1 is equivalent to one of the conditions (ii), (iii)

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Show directly that condition (i) of Lemma 8.1 is equivalent to one of the conditions (ii), (iii) and (iv).

Data from lemma 8.1

Let (X,A) be a measurable space. The function u: XR is A/B(R)-measurable if, and only if, one, and hence all,

Proof Combine Remark 3.9 and Lemma 7.2. It is often helpful to use the values + and - in calculations. To do

Caution R is not a field. Expressions of the form tx +  and must be avoided. The Borel o-algebra B(R) is

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