A dichotomy for complex Robin eigenvalues at large boundary parameter, with new numerical range bounds, a Dirichlet-to-Neumann proof, and interval, rectangle and ball asymptotics.
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On the eigenvalues of the Robin Laplacian with a complex parameter
A dichotomy for complex Robin eigenvalues at large boundary parameter, with new numerical range bounds, a Dirichlet-to-Neumann proof, and interval, rectangle and ball asymptotics.