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math.SP2018
Spectral monotonicity for Schrödinger operators on metric graphs
Jonathan Rohleder, Christian Seifert
We study the influence of certain geometric perturbations on the spectra of self-adjoint Schrödinger operators on compact metric graphs. Results are obtained for permutation invari…
math.FA2018
A note on perturbations of -semigroups
Christian Seifert, Hendrik Vogt, Marcus Waurick
This article deals with a variation of constants type inequality for semigroups acting consistently on a scale of Banach spaces. This inequality can be characterized by a correspon…