NU表示这个约束的上界有一个非基本变量。

NU means that there's a non-basic variable on the upper bound for that constraint.

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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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