[1]. This exercise is used in Sections 3.2 and 5.2. For each real function f define the

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[1]. This exercise is used in Sections 3.2 and 5.2. For each real function f define the positive part of f by f+(x) = If(x)l; f(x), x E Dom(f)

and the negative part of f by r(x) = If(x)l; f(x), x E Dom(f).

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