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arXiv 1201.4055math.AP
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非变分奇异椭圆型方程的几何解法

Geometric approach to nonvariational singular elliptic equations

Damião Araújo, Eduardo V. Teixeira

摘要:

本文发展了一种系统的几何方法来研究具有奇异吸收项的完全非线性椭圆型方程及其相关的自由边界问题。奇异性的大小由负参数$(γ-1)$测量,对于$0 < γ< 1$,其反映了现有解沿着其正相位和零相位之间的奇异界面缺乏平滑性。我们建立了解的存在性以及尖锐的正则性。我们进一步证明了极小解是非退化的,并得到了自由边界$\mathfrak{F} = \partial \{u > 0 \}$的精细几何测度性质。特别是,我们显示尖锐的Hausdorff估计,这意味着局部有限的周长区域$\{u > 0 \}$和$\mathcal{H}^{n-1}$ a.e. $\mathfrak{F}$的弱可微性

英文摘要:

In this work we develop a systematic geometric approach to study fully nonlinear elliptic equations with singular absorption terms as well as their related free boundary problems. The magnitude of the singularity is measured by a negative parameter $(γ-1)$, for $0 < γ< 1$, which reflects on lack of smoothness for an existing solution along the singular interface between its positive and zero phases. We establish existence as well sharp regularity properties of solutions. We further prove that minimal solutions are non-degenerate and obtain fine geometric-measure properties of the free boundary $\mathfrak{F} = \partial \{u > 0 \}$. In particular we show sharp Hausdorff estimates which imply local finiteness of the perimeter of the region $\{u > 0 \}$ and $\mathcal{H}^{n-1}$ a.e. weak differentiability property of $\mathfrak{F}$.

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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