It is also a sufficient condition for second order linear differential equation with varied coefficient to be integrable.

对于二阶变系数线性微分方程来说，这也是可积的一个充分条件。

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Then, the latter necessary and sufficient condition is generalized to the case for the two different point ranges of degenerate second order curve.

然后，再将非退化二阶曲线到自身的双射为对合的充要条件推广到退化二阶曲线两相异点列的情形。

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A second-order-sufficient-condition is one of basis for sensitivity analysis of optimization problems.

优化问题的二阶充分条件是研究灵敏度分析的基础。

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