79 citations · 501 across the 68 of their papers we have counts for
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Lower bounds for self-adjoint Sturm-Liouville operators
Jussi Behrndt, Fritz Gesztesy, Philipp Schmitz +1
In this note we provide estimates for the lower bound of the self-adjoint operator associated with the three-coefficient Sturm-Liouville differential expression $$ \frac{1}{r} \lef…
Boundary triples and Weyl functions for Dirac operators with singular interactions
Jussi Behrndt, Markus Holzmann, Christian Stelzer +1
In this article we develop a systematic approach to treat Dirac operators with singular electrostatic, Lorentz scalar, and anomalous magnetic interactions of strength…
Schrödinger operators with oblique transmission conditions in
Jussi Behrndt, Markus Holzmann, Georg Stenzel
In this paper we study the spectrum of self-adjoint Schrödinger operators in with a new type of transmission conditions along a smooth closed curve $Σ\subseteq…
Relative oscillation theory and essential spectra of Sturm--Liouville operators
Jussi Behrndt, Philipp Schmitz, Gerald Teschl +1
We develop relative oscillation theory for general Sturm-Liouville differential expressions of the form \[ \frac{1}{r}\left(-\frac{\mathrm d}{\mathrm dx} p \frac{\mathrm d}{\mathrm…