Question: Let f be defined on [a,b] and define f+(x) = f(x) if f(x) =>0 and 0 if f(x) <0 . Prove that for any partition

Let f be defined on [a,b] and define f+(x) = f(x) if f(x) =>0 and 0 if f(x) <0 . Prove that for any partition P of [a,b] U((f+, P) - L(f+,P) <= U(f,P) - L(f,P)

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