After finite iterations, the iteration point gets into the feasible set and the master direction is a feasible direction of descent.

有限次迭代后，迭代点进入可行集且主方向是一可行下降方向。

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So at every nonstationary point there exists at least one feasible descent direction, every iterate generated by the methods is feasible so long as the initial iterate is feasible.

这样在每一个非稳定点处至少存在一个可行的下降方向，在初始点是可行点的条件下，此算法产生的每一个迭代点都是可行点。

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