Boundary integral formulations of eigenvalue problems for elliptic differential operators with singular interactions and their numerical approximation by boundary element methods

Markus Holzmann, Gerhard Unger

In this paper the discrete eigenvalues of elliptic second order differential operators in $L^2({\mathbb{R}}^n)$, $n\in \mathbb{N}$, with singular $\delta$- and ${\delta }^{\prime }$-interactions are stud…