Abstract
In this paper, we prove an isoperimetric inequality for lower order eigenvalues of the free membrane problem on bounded domains in a Euclidean space or a hyperbolic space which strengthens the well-known Szegö–Weinberger inequality and supports a celebrated conjecture of Ashbaugh–Benguria.
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The authors would like to thank the referee for the careful reading of the manuscript and the encouragements.
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Xia, C., Wang, Q. On a conjecture of Ashbaugh and Benguria about lower eigenvalues of the Neumann laplacian. Math. Ann. 385, 863–879 (2023). https://doi.org/10.1007/s00208-021-02336-x
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DOI: https://doi.org/10.1007/s00208-021-02336-x