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arXiv 1801.04237math.AP
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位势论反问题

Inverse problem of potential theory

A. G. Ramm

摘要:

P. Novikov在1938年证明了,如果$u_1(x)=u_2(x)$ for $|x|>R$,其中$R>0$是一个大数,$$u_j(x):=\int_{D_j}g_0(x,y)dy, \quad g_0(x,y):=\frac 1 {4π|x-y|},$$和$D_j\subset \mathbb{R}^3$,$j=1,2,$ $D_j\subset B_R$是有界的、连通的、光滑的区域,关于一个公共点是星形的,那么$D_1=D_2$。这里是$B_R:= \{x: |x|\le R\}$。我们的基本结果是:a)去掉了$D_j$的星形假设,b)提出了一种新的求解方法,c)构造了一个类似问题的反例,其中$g_0$被$g=\frac {e^{ik|x-y|}}{4π|x-y|}$代替,其中$k>0$是一个固定常数.

英文摘要:

P. Novikov in 1938 has proved that if $u_1(x)=u_2(x)$ for $|x|>R$, where $R>0$ is a large number, $$u_j(x):=\int_{D_j}g_0(x,y)dy, \quad g_0(x,y):=\frac 1 {4π|x-y|},$$ and $D_j\subset \mathbb{R}^3$, $j=1,2,$ $D_j\subset B_R$, are bounded, connected, smooth domains, star-shaped with respect to a common point, then $D_1=D_2$. Here $B_R:= \{x: |x|\le R\}$. Our basic results are: a) the removal of the assumption about star-shapeness of $D_j$, b) a new approach to the problem, c) the construction of counter-examples for a similar problem in which $g_0$ is replaced by $g=\frac {e^{ik|x-y|}}{4π|x-y|}$, where $k>0$ is a fixed constant.

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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