常微分方程边值问题是常微分方程理论研究中最为重要的课题之一。

The ordinary differential equation singular boundary value problem is one of the most important branches of ordinary differential equations.

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利用随机微分方程理论，对一类具有随机特征的风险投资组合问题进行深入研究。

With the theory of stochastic differential equation, the authors discuss a problem of a class of risk investment portfolio with stochastic character.

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运用随机微分方程理论，推导了一个水质模型，提出了河流水质管理的随机规划方法。

This paper deduces a water quality model by using the theory of random differential equations, and proposes a stochastic method for water quality management at a river.

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