A spokesman said the plane was checked, no bomb was found and the aircraft left an hour and a half late. He added that such alerts were relatively common.

一位发言人说他们检查了飞机，没有发现炸弹，却导致飞机晚点一个半小时，他还说他们经常接到这样的警告。

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In this paper, we present an iterative method for determining whether all roots of characteristic polynomial are on the left half-plane.

本文提出一种确定特征多项式的全部根是否位于左半平面的迭代法。

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The value function turns out to be continuous in the whole plane, and is even continuously differentiable in the interiors of both right and left half planes.

说明了值函数在整个平面上是连续的，在左右两个半平面的内部还是连续可微的。

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