查询词典 nonexistence

Under the conditions that the concrete expression of its singularities are not sloved,we discuss the bounded property of trajectories, separatrix configuration,nonexistence and existence of limit cycle.

对一类多分子反应模型x＝1－αx－xpyq，y＝βy（xpyq－1－1）进行定性分析，在第一象限奇点无法具体求出的条件下，讨论了轨线的有界性，分界线的位置关系以及极限环的存在性和不存在

Secondly, by using the Sobolev inequality on the C-C spaces we prove a Fefferman-Phong type lemma. Based on which we provide nonexistence theorems to three kinds of nonlinear subelliptic parabolic equations through a relatively unified method.

其次，利用Carnot-Caratheodory空间上的Sobolev不等式证明了一个Fefferman-Phong型引理，并用比较统一的方法证明了三类非线性次椭圆抛物方程解的不存在性判定定理。

By using the fixed-point index theory, we investigate the effect ofσ~2 on the existence and nonexistence of positive solution for the system in sublinear cases.

在次线性情形，研究了σ~2对于该系统正解的存在性和不存在性的影响，主要工具是不(来源：A88BC论文网www.abclunwen.com)动点指数理论。

By means of a priori estimates, a nonexistence theory for a class of quasilinear parabolic equations is established.

在第一章中，利用ODE方法，证明了一类散度型拟线性椭圆型方程边值问题径向解的存在性。

Chapter four is on nonexistence of entire solutions of quasilinear parabolic equations .

用积分方法给出了一类拟线性椭圆型方程径向整体解存在的一个充要条件，推广了已有的结果。

They change endlessly between emptiness and substance, ens and nonexistence.

它们只是在有与无，空与实之间，不断地转变而已。

I'm strongly against the death penalty — it's an eye for an eye.

我不赞成死刑——这是以牙还牙的报复行为。

And to get you the support you need, we're enlisting all elements of our national power: our diplomacy and development, our economic might and our moral suasion, so that you and the rest of our military do not bear the burden of our security alone.

并给你们所须的支援，我们正徵召国家所有各种的力量：我们的外交及发展，我们的经济力量与道德劝说，所以你们与其他军人不须要孤独地负起国家安全的责任。