Assume f > g two measurable function on [a,b] and E={(x,y) : g(x)≤y≤f(x), x ∈ [a,b]} Show ∫ (f-g) dm = m×m E . that m is lebesgue measure. (limits of integration is a,b) help will be appreciated so much
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Hint:Fubini Theorem
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