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Question: please can someone help me with this problem thank you...

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Please can someone help me with this problem? Thank you.

5.1.8. This exercise is used in Sections *5.5, 6.2, and *7.5 a) If f is increasing on la, b] and Pxo...Xn) is any partition of la, bl, prove that 7n j-1 b) Prove that if f is monotone on [a, b], then f is integrable on la, b [Note: By Theorem 4.19, f has at most countably many (i.e., relatively few) discontinuities on [a, b]. This has nothing to do with the proof ot part b), but points out a general principle which will be discussed m Section 9.6.]
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