4 citations · 4 across the 2 of their papers we have counts for
4 papers
Approximation of eigenvalues of Schrödinger operators
Johannes F. Brasche, Robert Fulsche
It is known that convergence of l.s.b. closed symmetric sesquilinear forms implies norm resolvent convergence of the associated self-adjoint operators and this in turn convergence…
Boundary triplets, tensor products and point contacts to reservoirs
A. A. Boitsev, J. F. Brasche, M. M. Malamud +2
We consider symmetric operators of the form where is symmetric and is (in general) unbounded. Such operato…
One-dimensional Schrödinger operators with -interactions on a set of Lebesgue measure zero
Johannes F. Brasche, Leonid Nizhnik
We give an abstract definition of a one-dimensional Schrödinger operator with -interaction on an arbitrary set~ of Lebesgue measure zero. The number of negative eigenvalues…
Convergence of Schrodinger operators
J. F. Brasche, K. Ozanova
For a large family of real-valued Radon measures m on R^d, including the Kato class, the operators -Δ+ C^2 Δ^2 + m tend to the Schrodinger operator -Δ+m in the norm resolvent sense…