针对这一问题，文章提出了求非负变量等式约束基本可行解的一种方法。

In this paper, the authors establish a new method of finding the base feasible solution for linear program subject to non-negative variables and equality constraints.

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从数学角度看，这种研究主要是对一个或多个非负随机变量进行统计分析。

From the mathematical point of view, survival analysis is a type of statistical analysis towards one or more non-negative random variables.

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在第二章，本文讨论了带有控制变化尾的，负相协随机变量的非随机和和随机和的精致大偏差。

In Chapter 2, we discuss the precise large deviations for non-random and random sums of negatively associated nonnegative random variables with common dominatedly varying tail distribution function.

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