这是一个概率问题，但用微分方程解决，故称概率微分模型。
This is a probability problem, called it probability differential model because it's solved by differential equation.
以往关于生物种群增长的数学模型多是用微分方程和概率极限定理的方法来推导的。
Differential equation and probability limit theorem have been widely used in the mathematical model of biological population growth.
引进带干扰负风险和模型。给出该模型的破产概率所满足的积分-微分方程及解析式。
The paper considers a risk model with negative risk sum perturbed by diffusion. The integro-differential equation and the explicit expression for the ruin probability are derived.
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