A bound for the eigenvalue counting function for Krein--von Neumann and Friedrichs extensions

Mark S. Ashbaugh, Fritz Gesztesy, Ari Laptev +2

For an arbitrary open, nonempty, bounded set $\Omega \subset {\mathbb{R}}^n$, $n\in \mathbb{N}$, and sufficiently smooth coefficients $a,b,q$, we consider the closed, strictly positive, h…