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A Characterization of the Lebesgue Integral
Published online by Cambridge University Press: 20 November 2018
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The first general integrability criterion is due to Riemann. He observed that a necessary and sufficient condition for a function f(x) on [a, b] to be integrable in his sense is that for each ε > 0 there exists a δ > 0 so that
where {x0, x1, …, xn} is a partition of [a, b] with diameter less than δ (and ω(f, I) denotes the oscillation of f on the interval I).
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- Copyright © Canadian Mathematical Society 1977
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