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- W4290192283 abstract "We present some new bounds for the first Robin eigenvalue with a negative boundary parameter. These include the constant volume problem, where the bounds are based on the shrinking coordinate method, and a proof that in the fixed perimeter case the disk maximises the first eigenvalue for all values of the parameter. This is in contrast with what happens in the constant area problem, where the disk is the maximiser only for small values of the boundary parameter. We also present sharp upper and lower bounds for the first eigenvalue of the ball and spherical shells. These results are complemented by the numerical optimisation of the first four and two eigenvalues in 2 and 3 dimensions, respectively, and an evaluation of the quality of the upper bounds obtained. We also study the bifurcations from the ball as the boundary parameter becomes large (negative)." @default.
- W4290192283 created "2022-08-07" @default.
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- W4290192283 date "2016-05-26" @default.
- W4290192283 modified "2023-10-16" @default.
- W4290192283 title "Bounds and extremal domains for Robin eigenvalues with negative boundary parameter" @default.
- W4290192283 doi "https://doi.org/10.48550/arxiv.1605.08161" @default.
- W4290192283 hasPublicationYear "2016" @default.
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