2 problems

Let $\Omega\subset\mathbb{R}^d$ be a bounded Lipschitz domain, and let $\lambda_1(\Omega,\sigma,\alpha,\beta,\gamma)$ be the first eigenvalue of the Robin bilaplacian with paramete…

Let $\Omega\subset\mathbb{R}^d$ be the domain and let $\mathcal{A}[\beta,\gamma]$ denote the operator associated with the Robin bilaplacian for parameters $\beta,\gamma$, with…