After constrcting the perfective space, prove that this space is just the space of Lebesgue integratiable function, thus explain that Lebesgue integral is the form of the perfective Riemann integral.
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- 在构造了完备化空间之后,证明了该空间就是勒贝格可积函数空间,从而说明了黎曼积分的完备化形式是勒贝格积分。