M. Winklmeier

collaborators

2 papers

math.SP2025

1-D SchrÃ¶dinger operator on a star graph with nondefinite weight function

Edison LeguizamÃ³n, Carsten Trunk, Mitsuru Wilson +1

On a star graph $G$ with $n = n_{+} + n_{-}$ edges of unit length, we study the operator $- \frac{d ^{2}}{d x ^{2}}$ on $n_{+}$ and $\frac{d ^{2}}{d x ^{2}}$ on $n…

math.SP2025

Scattering theory for difference equations with operator coefficients

David Sher, Luis Silva, Boris Vertman +1

We consider a second order difference equation with operator-valued coefficients. More precisely, we study either compact or trace class perturbations of the discrete Laplacian in…