On a Conjecture of Ashbaugh and Benguria about Lower Eigenvalues of the Neumann Laplacian

preprint2020arXivOpen access

Abstract

In this paper, we prove an isoperimetric inequality for lower order eigenvalues of the free membrane problem on bounded domains of a Euclidean space or a hyperbolic space which strengthens the well-known Szegö-Weinberger inequality and supports strongly an important conjecture of Ashbaugh-Benguria.

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