There are some results on the comparison of weak solutions of homogeneous hyperbolic system and its approximate model.
对于上述齐次双曲守恒律方程组与其近似模型之间解的比较，已经有人得到了相关结果。
The uniqueness problem of the weak solutions of the time dependent drift diffusion model for semiconductor equation with avalanche term is considered.
研究带雪崩项的半导体漂移-扩散模型方程弱解的惟一性问题。
This paper discusses the existence of a class of singular elliptic boundary value problems. Under certain conditions, we prove that weak solutions exist.
讨论了一类具有奇异性的椭圆问题解的存在性。证明了在一定条件下，弱解存在。
Thfi existence and uniqueness theorems of weak solutions of initial-boundary value problems for nonlinear degenerate parabolic systems were established by lower-upper solution method.
应用上、下解方法证明非线性退缩抛物型方程组初边值问题弱解的存在唯一性。
Then the natural question is how to estimate the difference of the weak solutions to the systems describing different models, especially to estimate the weak solutions with shock waves.
因此很自然的问题就是如何对不同的近似模型的解进行比较，尤其是对带有激波间断的整体弱解进行比较。
The aim of this thesis is to study the existence of weak solutions for semilinear second order elliptic boundary value problems under suitable conditions through topological and variational methods.
本文主要利用拓扑度理论中的不动点定理和变分方法中的极小作用原理及其环绕形式的临界点定理在适当的条件下讨论了一类二阶椭圆边值问题的可解性。
And if these organizations are weak, solutions to global problems will simply not emerge.
如果这些组织机构的功能被削弱了，就无法很好的解决全球性问题。
And if these organizations are weak, solutions to global problems will simply not emerge.
如果这些组织机构的功能被削弱了，就无法很好的解决全球性问题。
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