The population system is a dynamical system.
人口是一个动态系统。
The optimal harvesting problem for a semi-linear age-dependent time-varying population system is discussed.
讨论了年龄相关的半线性时变种群系统的最优捕获控制问题。
In this paper, the existence of the optimal harvesting control for a class of non-linear population system is proved.
研究了一类半线性时变种群扩散系统的最优收获问题，证明了最优收获控制的存在性。
At the same time, a more precise model of the population system is given and the corresponding critical fertility rate is obtained.
并给出了人口系统的更为精细的模型，求得了相应的临界生育率。
The study of population-economy system should start with the population system, and at the same time, every sub-system should be analysed and synthesized.
研究人口——经济系统，首先从人口系统着手，并分别对各子系统进行分析和综合。
The study of population-economy system should start with the population system, and at the same time, every sub-system should be analysed and synthesized.
研究人口——经济系统，首先从人口系统着手，并分别对各子系统进行分析和综合。
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