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- W2489317527 abstract "We find the Courant-sharp Neumann eigenvalues of the Laplacian on some 2-rep-tile domains. In $R^{2}$ the domains we consider are the isosceles right triangle and the rectangle with edge ratio $sqrt{2}$ (also known as the A4 paper). In $R^{n}$ the domains are boxes which generalize the mentioned planar rectangle. The symmetries of those domains reveal a special structure of their eigenfunctions, which we call foldingtextbackslash{}unfolding. This structure affects the nodal set of the eigenfunctions, which in turn allows to derive necessary conditions for Courant-sharpness. In addition, the eigenvalues of these domains are arranged as a lattice which allows for a comparison between the nodal count and the spectral position. The Courant-sharpness of most eigenvalues is ruled out using those methods. In addition, this analysis allows to estimate the nodal deficiency - the difference between the spectral position and the nodal count." @default.
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- W2489317527 date "2016-11-29" @default.
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- W2489317527 title "Courant-sharp eigenvalues of Neumann 2-rep-tiles" @default.
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- W2489317527 doi "https://doi.org/10.1007/s11005-016-0926-7" @default.
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