A method, combination of grey-system theory with multivariate regression linear analysis, was used to predict the output of municipal solid waste (MSW).

将灰色系统理论与多元线性回归分析方法相结合，是研究城市生活垃圾产量预测的一种改进方法。

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According to unary function limit and multivariate function limit of mathematical Analysis, the validity of the index Vnew is proved in theory.

并根据数学分析中一元函数和多元函数的极限的相关知识，在理论上证明了该指标的有效性。

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