# Article

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Keywords:
Laplace operator; Robin boundary condition; eigenvalue; large parameter
Summary:
We consider the Robin eigenvalue problem $\Delta u+\lambda u=0$ in $\Omega$, ${\partial u}/{\partial \nu }+\alpha u=0$ on $\partial \Omega$ where $\Omega \subset \mathbb R^n$, $n \geq 2$ is a bounded domain and $\alpha$ is a real parameter. We investigate the behavior of the eigenvalues $\lambda _k (\alpha )$ of this problem as functions of the parameter $\alpha$. We analyze the monotonicity and convexity properties of the eigenvalues and give a variational proof of the formula for the derivative $\lambda _1'(\alpha )$. Assuming that the boundary $\partial \Omega$ is of class $C^2$ we obtain estimates to the difference $\lambda _k^D-\lambda _k(\alpha )$ between the $k$-th eigenvalue of the Laplace operator with Dirichlet boundary condition in $\Omega$ and the corresponding Robin eigenvalue for positive values of $\alpha$ for every $k=1,2,\dots$.
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