期刊
JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL
卷 38, 期 9, 页码 L163-L170出版社
IOP PUBLISHING LTD
DOI: 10.1088/0305-4470/38/9/L02
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A famous inverse problem posed by M Kac 'Can one hear the shape of a drum?' is concerned with isospectrality of drums or planer billiards, and the first counter example was constructed by Gordon, Webb and Wolpert (1992 Invent. Math. 110 1). Here we present pieces of numerical evidence showing that 'One can distinguish isospectral drums by measuring the scattering poles of exterior Neumann problems'. This is based on the observation that the Fredholm determinant appearing in the boundary element method admits a factorization into interior and exterior parts.
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