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On hearing the shape of a triangle

Authors: Pei-Kun Chang and Dennis DeTurck
Journal: Proc. Amer. Math. Soc. 105 (1989), 1033-1038
MSC: Primary 58G25; Secondary 35P99, 35R30
MathSciNet review: 953738
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Abstract: To determine whether two triangles in the Euclidean plane are congruent, it suffices to know that they have their first $ N$ eigenvalues in common, where $ N$ depends on the first two eigenvalues of the triangles. Similar results for other figures are given.

References [Enhancements On Off] (What's this?)

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Keywords: Eigenvalues of Laplacian, inverse spectral problem
Article copyright: © Copyright 1989 American Mathematical Society