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arXiv 1009.4571math.AP
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强耦合椭圆型微分系统的弱最大值原理

Weak Maximum Principle for Strongly Coupled Elliptic Differential Systems

Xu Liu, Xu Zhang

摘要:

一个由E. De Giorgi等人证明了弱最大值原理对一般的线性椭圆型微分系统不成立。在此之后,有人试图建立特殊椭圆型微分系统的弱最大值原理,但现有的工作都是针对弱耦合系统,几乎对角系统,甚至某些低阶耦合系统的情形。本文在相当温和的物理合理的假设下,给出了两类具有不同主部的耦合线性椭圆型微分方程组弱解的最大模估计.所考虑的系统在二阶项和其他低阶项上是强耦合的,对不同主部系数之比的大小、方程的个数和空间变量的个数没有限制。

英文摘要:

A classical counterexample due to E. De Giorgi, shows that the weak maximum principle does not remain true for general linear elliptic differential systems. After that, there are some efforts to establish the weak maximum principle for special elliptic differential systems, but the existing works are addressing only the cases of weakly coupled systems, or almost-diagonal systems, or even some systems coupling in various lower order terms. In this paper, by contrast, we present maximum modulus estimates for weak solutions to two classes of coupled linear elliptic differential systems with different principal parts, under considerably mild and physically reasonable assumptions. The systems under consideration are strongly coupled in the second order terms and other lower order terms, without restrictions on the size of ratios of the different principal part coefficients, or on the number of equations and space variables.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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