On the eigenvalue problem for a bulk/surface elliptic system

Enzo Vitillaro

The paper addresses the doubly elliptic eigenvalue problem $$\begin{cases} -Δu=λu \qquad &\text{in $\Omega$,}\\ u=0 &\text{on ${\Gamma }_0$,}\\ -Δ_Γu +\partial_νu =λu\qquad &\text{on ${\Gamma }_1$,} \e…