arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.03699math.AP
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关于散度型椭圆混合边值问题的临界理论

On criticality theory for elliptic mixed boundary value problems in divergence form

Yehuda Pinchover, Idan Versano

摘要:

研究了区域$D\subseteq \mathbb{R}^n$中二阶线性散度型椭圆方程的正解,其中区域$\partial D$的一部分满足斜边界条件.首先,我们研究退化混合边值问题$$ \begin{cases} Pu=f & \text{in } D, \\ Bu = 0 & \text{on } \partial D_{\mathrm{Rob}}, \\ u=0& \text{on } \partial D_{\mathrm{Dir}}, \end{cases} $$,其中$D$是有界Lipschitz域,$\partial D_{\mathrm{Rob}}$是$\partial D$的相对开部分,$\partial D_{\mathrm{Dir}}$是$\partial D$的闭集,$B$是定义在$\partial D_{\mathrm{Rob}}$上的斜(Robin)边界算子。特别地,我们讨论了上述问题的唯一可解性,主特征值的存在性,以及正的极小格林函数的存在性。然后在一般区域上建立了算子$(P,B)$的正弱解的临界性理论,其中$\partial D_{\mathrm{Dir}}$上没有边界条件,无穷远处也没有增长条件。本文推广和推广了Pinchover和Saadon(2002)关于这类问题经典解的结果,其中对$(P,B)$和$\partial D_{\mathrm{Rob}}$的系数作了更强的正则性假设.

英文摘要:

The paper is devoted to the study of positive solutions of a second-order linear elliptic equation in divergence form in a domain $D\subseteq \mathbb{R}^n$ that satisfy an oblique boundary condition on a portion of $\partial D$. First, we study the degenerate mixed boundary value problem $$ \begin{cases} Pu=f & \text{in } D, \\ Bu = 0 & \text{on } \partial D_{\mathrm{Rob}}, \\ u=0& \text{on } \partial D_{\mathrm{Dir}}, \end{cases} $$ where $D$ is a bounded Lipschitz domain, $\partial D_{\mathrm{Rob}}$ is a relatively open portion of $\partial D$, $\partial D_{\mathrm{Dir}}$ is a closed set of $\partial D$, and $B$ is an oblique (Robin) boundary operator defined on $\partial D_{\mathrm{Rob}}$. In particular, we discuss the unique solvability of the above problem, the existence of a principal eigenvalue, and the existence of a positive minimal Green function. Then we establish a criticality theory for positive weak solutions of the operator $(P,B)$ in a general domain with no boundary condition on $\partial D_{\mathrm{Dir}}$ and no growth condition at infinity. The paper generalizes and extends results obtained by Pinchover and Saadon (2002) for classical solutions of such a problem, where stronger regularity assumptions on the coefficients of $(P,B)$, and $\partial D_{\mathrm{Rob}}$.

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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