On efficiency and localisation for the torsion function

M. van den Berg, D. Bucur, T. Kappeler

We consider the torsion function for the Dirichlet Laplacian $-\Delta$, and for the Schrödinger operator $-\Delta +V$ on an open set $\Omega \subset {\mathbb{R}}^m$ of finite Lebesgue measure $0<|Ω|<\infty…