Authors conjecture that the count of Neumann eigenvalues ≤ first Dirichlet eigenvalue is governed by the domain's isoperimetric ratio, backed by analysis and numerics, with applications to nodal deficiency and Yau's nodal set conjecture.
66, Society for Industrial and Applied Mathematics (SIAM), Philadelph ia, PA, 2011, Revised edition of the 1992 original [ 1177405]
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Isoperimetric relations between Dirichlet and Neumann eigenvalues
Authors conjecture that the count of Neumann eigenvalues ≤ first Dirichlet eigenvalue is governed by the domain's isoperimetric ratio, backed by analysis and numerics, with applications to nodal deficiency and Yau's nodal set conjecture.