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arXiv 2204.02532math.AP
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二维快振荡系数椭圆型方程的临界集

Critical Sets of Elliptic Equations with Rapidly Oscillating Coefficients in Two Dimensions

Fanghua Lin, Zhongwei Shen

摘要:

本文继续研究具有快速振荡和周期系数的二阶散度型椭圆型方程的临界解集$u_\e$.在\cite{Lin-Shen-3d}中,通过控制近似切面的“转向”,证明了在解的加倍指数有界的条件下,临界集的$(d-2)$维Hausdorff测度关于周期$\e$一致有界.在本文中,我们使用一种不同的方法,基于减少的加倍指数的$u_\e$,研究二维的情况下。证明依赖于这样一个事实,即一个齐次调和多项式的临界集的次数为二或更高的二维只包含一个点。

英文摘要:

In this paper we continue the study of critical sets of solutions $u_\e$ of second-order elliptic equations in divergence form with rapidly oscillating and periodic coefficients. In \cite{Lin-Shen-3d}, by controling the "turning" of approximate tangent planes, we show that the $(d-2)$-dimensional Hausdorff measures of the critical sets are bounded uniformly with respect to the period $\e$, provided that doubling indices for solutions are bounded. In this paper we use a different approach, based on the reduction of the doubling indices of $u_\e$, to study the two-dimensional case. The proof relies on the fact that the critical set of a homogeneous harmonic polynomial of degree two or higher in dimension two contains only one point.

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