Wolf-Keller theorem for Neumann eigenvalues
Wolf-Keller theorem for Neumann eigenvalues
复制标题
诺伊曼特征值的沃尔夫-凯勒定理
DOI:
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发表时间:
2010
期刊:
影响因子:
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通讯作者:
Guillaume Roy
中科院分区:
文献类型:
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作者:
G. Poliquin;Guillaume Roy
The classical Szego-Weinberger inequality states that among bounded planar domains of given area, the first nonzero Neumann eigenvalue is maximized by a disk. Recently, it was shown by Girouard, Nadirashvili and Polterovich that, for simply connected planar domains of given area, the second nonzero Neumann eigenvalue is maximized in the limit by a sequence of domains degenerating to a disjoint union of two identical disks. We prove that Neumann eigenvalues of planar domains of fixed area are not always maximized by a disjoint union of arbitrary disks. This is an analogue of a result by Wolf and Keller proved earlier for Dirichlet eigenvalues.