# User:Daviddaved/"Can One Hear the Shape of a Drum?"

Let $\lambda_k$ be the Dirichlet eigenvalues for the domain $\Omega$, that is, the eigenvalues of the Dirichlet problem for the Laplacian:
$\begin{cases} \Delta u + \lambda u = 0, \\ u|_{\partial \Omega} = 0. \end{cases}$