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。

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

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结果推广了该问题可积的一些原有结果，并给出了通解的参数表示式。

Results Original integrable results of this problem are generalized and parametric expression of the general solution is given.

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分析了诸多积分概念的共性，抽象出黎曼积分的定义，给出了黎曼可积的条件。

This paper sums up the common character of the concept of many integrals, abstracts the concept of Riemann integral and gives the integral conditions of the Riemann integral.

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