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 \( k \ge 3 \).
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Submitted: March 1998, revised: May 1999.
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Hoffmann-Ostenhof, T., Michor, P. & Nadirashvili, N. Bounds on the Multiplicity of Eigenvalues for Fixed Membranes . GAFA, Geom. funct. anal. 9, 1169–1188 (1999). https://doi.org/10.1007/s000390050111
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DOI: https://doi.org/10.1007/s000390050111