Range of the first three eigenvalues of the planar Dirichlet Laplacian
Michael Levitin, Rustem Yagudin
Abstract
We conduct extensive numerical experiments aimed at finding the admissible range of the ratios of the first three eigenvalues of a planar Dirichlet Laplacian. The results improve the previously known theoretical estimates of M Ashbaugh and R Benguria. We also prove some properties of a maximizer of the ratio λ3/λ1.
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