查询词典 invariance theorem

By using of the comparison theorem and some results, some sufficient and necessary conditions are derived for permanence of the periodic system and non-permanence of predators.

运用比较定理和一些主要结果，得到了系统永久持续生存和捕食者灭绝的充分必要条件。

In the first chapter, we research the dynamics of population which were in the polluted environment, we will: give the corresponding mathematical model;(2): obtain the explicit conditions for the threshold of the population by means of comparison theorem.

第一章是研究污染环境中种群的动力学行为，首先给出相应受污染系统的数学模型，然后研究系统中种群的持久生存和灭绝问题，在具体模型中，运用比较定理研究种群生存的阈值。

Under the most elementary conditions for backward stochastic differential equation introduced by Peng S., we put forward and prove a general converse comparison theorem.

在由彭实戈引入的倒向随机微分方程的最基本的条件下，提出并证明了一个一般的反比较定理。

In the forth chapter, by employing the comparison theorem in theory of difference equations together with pure analysis, we get sufficient conditions for permanence of a class of ratio-dependent discrete system.

第四章运用差分方程理论中的比较定理和纯分析的方法得到离散系统持久性的充分条件。

Model of experiments was calculated by this Method and calculation results compared with Experiment results. Comparison shows upper-bound theorem of limit analysis is feasible, simple and accurate in calculation.

运用极限分析上限法对试验模型进行计算，并将计算结果与试验结果进行了对比分析，分析表明，利用极限分析上限法不仅简单可行，且具有较高的计算精度。

In this paper, we study the comparison theorem of backward doubly stochastic differ-ential equtions with continuous coefficient by Tanaka-Meyer formula.

利用Tanaka-Meyer公式研究了双重倒向随机微分方程在连续条件下的比较定理。

By applying the comparison theorem and some new analysis technique, some sufficient conditions which guarantee the permanence of the system are obtained. After that, by constructing a suitable Lyapunov function, sufficient conditions which ensure the global attractivity of the system are obtained.

利用差分方程的有关理论，使用与前面不同的分析方法，获得保证该系统永久持续生存的充分性条件；其后通过构造适当的差分Lyapunov函数，得到保证该系统全局吸引的充分性条件。

Rties of the system are researched by using the comparison theorem of impulsive ordinary differential equations and using the solutions of dominating inpulsive ordinary differential equation to control and estimate the solutions of the system.

利用脉冲常微分方程的比较定理以及利用相应的脉冲常微分方程的解控制和估计所讨论模型的解，研究了系统模型的解的渐近性质。

By using Floquet theory, Comparison theorem of impulsivedifferential equation and analytic method, we investigate the dynamics of thesystem in detail.

通过利用脉冲微分方程的Floquet理论和比较原理，证明了当脉冲周期小于某个临界值时，系统存在一个全局渐近稳定的害虫根除周期解，最后给出了系统持续生存的条件。3。

In this article, we discuss the solution ofbackward stochastic differential equation and the generalizes comparison theorem and concernedthe relation between g-Expection and the minimum expection.

本文主要讨论如上倒向随机微分方程的解的情况及相应的g-期望的性质以及其在数学金融方面的应用。

You have to walk your own alk in this life.

次生中你必须走自己的路。

To start with, the thesis analyses ***ism in terms of the generic masculine words, word order and semantic derogation of women in greater detail.

论文首先从阳性词泛指，词序，词义的贬降等方面对英语中的性别歧视现象进行了详细的分析。