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Bounds on the multiplicity of eigenvalues for fixed membranes

Thomas Hoffman-Ostenhof, Peter W. Michor, Nikolai Nadirashvili

math.AParXiv:math/9801090

Abstract

For a membrane in the plane the multiplicity of the k-th eigenvalue is known to be not greater than 2k-1. Here we prove that it is actually not greater than 2k-3, for k 3.

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