Folland Chapter 3 Exercise 20

Solution to exercise 3.20 from Gerald Folland's textbook, "Real Analysis: Modern Techniques and Their Applications."

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[carlosmunier]

v_r and v_i are signed measures, not necessarily positive measures, so the first use of the triangle inequality doesn't work.

[ForYourMath]

I remember struggling with this chapter, so I may have errors in a few of my solutions, as pointed out by a few comments.

[connorduncan]

In the second line, the triangle inequality should read no?