On spectrum of the Laplacian in a circle perforated along the boundary: application to a Friedrichs-type inequality
Summary: We construct and verify the asymptotic expansion for the spectrum of a boundary-value problem in a unit circle periodically perforated along the boundary. It is assumed that the size of perforation and the distance to the boundary of the circle are of the same smallness. As an application of the obtained results, the asymptotic behavior of the best constant in a Friedrichs-type inequality is investigated.
scientific article; zbMATH DE number 6013209
scientific article