Abstract
The abstract theory developed in previous chapters is applied to the spectral theory of the Laplacian on a bounded open set in Euclidean space. We define the sefl-adjoint extensions corresponding to classical boundary conditions. The chapter includes discussion of some classic spectral results, including the Weyl law, Courant’s nodal domain theorem, and eigenvalue comparison theorems.
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Borthwick, D. (2020). The Laplacian with Boundary Conditions. In: Spectral Theory. Graduate Texts in Mathematics, vol 284. Springer, Cham. https://doi.org/10.1007/978-3-030-38002-1_6
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DOI: https://doi.org/10.1007/978-3-030-38002-1_6
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